Ease the log format restriction in resolver binder test

It's not really useful that only accept {4,6} leading space
as the log format because the log output function is in netd
that is not a mainline module.
Remove the restriction.

Bug: 180530890
Test: atest resolv_integration_test
Change-Id: I39ce69e312d38dca91a397df3fb8678c4ecc2777