Merge branch 'tq/git-ssh-command'

Allow passing extra set of arguments when ssh is invoked to create an encrypted & authenticated connection by introducing a new environment variable GIT_SSH_COMMAND, whose contents is interpreted by shells. This is not possible with existing GIT_SSH mechanism whose invocation bypasses shells, which was designed more to match what other programs with similar variables did, not necessarily to be more useful. * tq/git-ssh-command: git_connect: set ssh shell command in GIT_SSH_COMMAND