Add git clone over ssh protocol

We need to have some short-hand for clonning over ssh:// protocol
this patch implements such functionality.
  Usage example:

   node {
     gitSSHCheckout {
       credentialsId = "mcp-ci-gerrit"
       branch = "mcp-0.1"
       host = "ci.mcp-ci.local"
       project = "projectcalico/calico-containers"
     }
   }

Change-Id: I5f8390cdbbd3df06cffa703190534fe10ecfd1ca
2 files changed
tree: 2196c64b634eb5bf205f13139f2fadcafad65525
  1. src/
  2. vars/
  3. .gitreview