improve plugin startup logging

[edaniszewski]

with the simple example plugin:

INFO[0000] [config] loading configuration                ext=yaml loader=plugin name=config paths="[. ./config /etc/synse/plugin/config]"
INFO[0000] [config] found valid config                   file=config.yml loader=plugin path=. policy=optional
INFO[0000] Plugin Info:                                 
INFO[0000]   Tag:         vaporio/simple-plugin         
INFO[0000]   Name:        simple plugin                 
INFO[0000]   Maintainer:  vaporio                       
INFO[0000]   VCS:                                       
INFO[0000]   Description: A simple example plugin       
INFO[0000] Version Info:                                
INFO[0000]   Plugin Version: 1.0                        
INFO[0000]   SDK Version:    3.0.0                      
INFO[0000]   Git Commit:     f8e5401                    
INFO[0000]   Git Tag:        1.2.0-33-gf8e5401          
INFO[0000]   Build Date:     2019-02-21T21:15:54        
INFO[0000]   Go Version:     go1.11.4                   
INFO[0000]   OS/Arch:        darwin/amd64               
INFO[0000] Plugin Config:                               
INFO[0000]   Version: 3                                 
INFO[0000]   Debug:   true                              
INFO[0000]   ID:                                        
INFO[0000]     UsePluginTag: true                       
INFO[0000]     UseMachineID: true                       
INFO[0000]     UseEnv:       []                         
INFO[0000]     UseCustom:    []                         
INFO[0000]   Settings:                                  
INFO[0000]     Mode: parallel                           
INFO[0000]     Listen:                                  
INFO[0000]       Disable: false                         
INFO[0000]     Read:                                    
INFO[0000]       Disable:   false                       
INFO[0000]       QueueSize: 128                         
INFO[0000]       Interval:  5s                          
INFO[0000]       Delay:     0s                          
INFO[0000]     Write:                                   
INFO[0000]       Disable:   false                       
INFO[0000]       QueueSize: 128                         
INFO[0000]       BatchSize: 128                         
INFO[0000]       Interval:  5s                          
INFO[0000]       Delay:     0s                          
INFO[0000]     Transaction:                             
INFO[0000]       TTL: 8m0s                              
INFO[0000]     Limiter:                                 
INFO[0000]       Rate:  0                               
INFO[0000]       Burst: 0                               
INFO[0000]     Cache:                                   
INFO[0000]       Enabled: false                         
INFO[0000]       TTL:     3m0s                          
INFO[0000]   Network:                                   
INFO[0000]     Type:    unix                            
INFO[0000]     Address: simple-plugin.sock              
INFO[0000]     TLS:                                     
INFO[0000]       Key:                                   
INFO[0000]       Cert:                                  
INFO[0000]       CACerts:    []                         
INFO[0000]       SkipVerify: false                      
INFO[0000]   DynamicRegistration:                       
INFO[0000]     Config: []                               
INFO[0000]   Health:                                    
INFO[0000]     HealthFile: /etc/synse/plugin/healthy    
INFO[0000]     Checks:                                  
INFO[0000]       DisableDefaults: false                 
INFO[0000] [device manager] initializing                
INFO[0000] [config] loading configuration                ext=yaml loader=device name= paths="[./config/device /etc/synse/plugin/config/device]"
INFO[0000] [config] found valid config                   file=led.yaml loader=device path=./config/device policy=required
INFO[0000] [config] found valid config                   file=test.yaml loader=device path=./config/device policy=required
DEBU[0000] [config] scanning config into struct          type="*config.Devices"
INFO[0000] [device manager] added new device             id=164bad3f-39a4-51df-b063-252c50b9aff6 type=led
INFO[0000] [device manager] added new device             id=cc22c237-68aa-57e7-b1a7-dd17c67bc1c7 type=led
INFO[0000] [device manager] added new device             id=54f07972-fc84-500e-96d9-2d2588aabe8f type=temperature
INFO[0000] [device manager] added new device             id=ac20f921-a0be-57a5-90e9-33f12b4ecb62 type=temperature
INFO[0000] [device manager] added new device             id=ab1f8f82-3cc3-5a12-bb77-d2c7e5cdfdd4 type=temperature
INFO[0000] [device manager] created devices              devices=5
DEBU[0000] [server] setting up server                   
INFO[0000] [server] tls/ssl not configured, using insecure transport 
INFO[0000] [device manager] starting                    
INFO[0000] [scheduler] starting...                      
INFO[0000] [plugin] will terminate on: [SIGTERM, SIGINT] 
INFO[0000] [scheduler] starting read scheduling          delay=0s interval=5s mode=parallel
INFO[0000] [scheduler] starting write scheduling         delay=0s interval=5s mode=parallel
DEBU[0000] [scheduler] sleeping for write interval       delay=0s interval=5s mode=parallel
INFO[0000] [scheduler] listeners will not be scheduled (no listener handlers registered) 
DEBU[0000] [scheduler] sleeping for read interval        delay=0s interval=5s mode=parallel
INFO[0000] [server] serving...                           addr=simple-plugin.sock mode=unix