Logging life cycle of each test

It's helpful for debugging each test to observe the behavior
between each test.

Sample log:
I resolv_private_dns_test: started: PrivateDnsDohTest#QueryFailover
    :
I resolv_private_dns_test: finished: PrivateDnsDohTest#QueryFailover

Test: atest resolv_integration_test
Bug: 223731710
Change-Id: I0335baa1762d35355d20bdf7a707b590f8a95c0c