Add an option for disabling the SSH multiplexer in QA
Add an option for disabling the SSH multiplexer in QA

The SSH multiplexer is used by default in every connection made, and
when multiple threads are used, this causes strange issues when running
the QA locally. This patch allows the multiplexer to be bypassed,
making a new connection every time.

Signed-off-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>
Reviewed-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>

andir/ganeti,yiannist/ganeti,onponomarev/ganeti,yiannist/ganeti,leshchevds/ganeti,mbakke/ganeti,andir/ganeti,dimara/ganeti,mbakke/ganeti,onponomarev/ganeti,andir/ganeti,yiannist/ganeti,dimara/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,grnet/snf-ganeti,apyrgio/ganeti,ganeti/ganeti,bitemyapp/ganeti,apyrgio/ganeti,bitemyapp/ganeti,ganeti/ganeti,ganeti/ganeti,ganeti-github-testing/ganeti-test-1,leshchevds/ganeti,grnet/snf-ganeti,leshchevds/ganeti