group_alias memDB table does not get initialized properly

[uepoch]

Describe the bug
When identityStore is initialized (post-unseal, leadership taken) it does not properly fill the group_alias memDB table.
Since all aliases content are stored in the identity group as well, any update on the group, will correctly save the alias in MemDB.

To Reproduce

#!/bin/bash

export VAULT_ADDR=http://localhost:8200
export VAULT_TOKEN=devtoken

function poison_pill
{
	pkill -P $$
}

FILE=$(mktemp)

function vault_up
{
	vault server -dev -dev-root-token-id="$VAULT_TOKEN" 2>&1 > $FILE &
}

function unseal_key
{
    grep 'Unseal Key:' $FILE | awk '{print $3}' | tr -d '\n'
}

function vault_reseal
{
    vault operator seal
    vault operator unseal $(unseal_key)
}

vault_up

trap poison_pill EXIT

set -e

sleep 1

GROUP_ID=$(vault write -format=json identity/group type=external name=test-group | jq -r '.data.id' | tr -d '\n')

vault auth enable ldap

ACCESSOR=$(vault auth list -format=json | jq -r '.["ldap/"].accessor' | tr -d '\n')

ALIAS_ID=$(vault write -format=json identity/group-alias name=test-alias canonical_id=$GROUP_ID mount_accessor=$ACCESSOR | jq -r '.data.id' | tr -d '\n')


echo "--- LIST ALL ALIASES"
vault list identity/group-alias/id
echo "---------------------"

echo "Resealing Vault"
vault_reseal

sleep 1

echo "--- LIST ALL ALIASES AFTER RE-UNSEAL"
vault list identity/group-alias/id
echo "---------------------"

rm -f "$FILE"

exit 1

Expected behavior
Aliases should get loaded properly

Environment:

• Vault Server Version (retrieve with vault status): master ( tested on 0.10 and 0.11 too)
• Vault CLI Version (retrieve with vault version): can be made via api calls
• Server Operating System/Architecture: all

Additional context
Impacts all backends as it's a functional problem in identityStore, not backend specific layer