Relax the check of network availability in CtsHostsideNetworkTests.

Bug: 35523062
Test: cts-tradefed run singleCommand cts-dev --module CtsHostsideNetworkTests -t \
      com.android.cts.net.HostsideRestrictBackgroundNetworkTests

Change-Id: I6c2df38fd7282a0cb9861afbb624018297d400fd
1 file changed