Jenkins test: parametrized the docker server
Jenkins test: parametrized the docker server

So we can specify on which IP the docker server is going to
serve Jenkins. This allows to work well with docker tools on macOS.

Change-Id: I4e001a8a1eecd732eab829d25d4a030f1d2889e3

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration