Merge pull request #622 from lightninglabs/postgres-connection-tuning #1693

Job	Run time
test vector check	1m 30s
cross compilation	16m 21s
Lint check	3m 14s
Docker build check	4m 14s
go mod check	1m 24s
RPC check	1m 56s
Format check	35s
run itests	11m 7s
run itests postgres	15m 6s
Sqlc check	28s
run unit tests (unit-race)	6m 9s
Compilation check	37s
run unit tests (unit-cover)	4m 14s
run unit tests (unit dbbackend=postgres)	5m 14s
	1h 12m 9s

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