add --ssh_verbosity flag to run_remote_tests

This CL adds a --ssh_verbosity flag to run_remote tests, that gets
passed through to autoserv. Values other than 0 might be useful for
debugging ssh issues.

CQ-DEPEND=CL:If705c03f9d9d70de89642f42904e2e9fdc40bf61
BUG=chromium:271621
TEST=Ran run_remote_tests with the new argument, ensured that it was
being passed along to autoserv. Note: using the maximum ssh verbosity
level of 3 frequently caused autoserv to hang. I will file a separate
issue about that once this is landed.

Change-Id: Ia3ecb3eaa4bf3054f236fa03bb347b60622767ca
Reviewed-on: https://gerrit.chromium.org/gerrit/65635
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
1 file changed