Speed up loading ACLs on startup #99

Job	Run time
Unit tests	1m 47s
Build for Linux (linux, amd64)	39s
Build for Windows (windows, amd64)	57s
Linting	2m 0s
Build for Linux (linux, 386)	48s
WASM build test	0s
Initial tests passed	2s
Integration tests	4m 9s
Sytest (SQLite native)	4m 31s
Upgrade tests	6m 56s
Sytest (SQLite Cgo)	4m 29s
Complement (SQLite native)	4m 2s
Sytest (PostgreSQL)	6m 7s
Complement (SQLite Cgo)	4m 23s
Upgrade tests from HEAD-2	7m 12s
Complement (PostgreSQL)	9m 7s
Integration tests passed	4s
Update Docker images	0s
	57m 13s

Provide feedback