Summary: This puts back the stronger variable replacement that was missed the last update to D7519.
Test Plan: Re-ran a remote build that had variables in the command and everything worked as expected.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley
CC: Korvin, epriestley, aran
Maniphest Tasks: T1049
Differential Revision: https://secure.phabricator.com/D7539
Summary: This adds a build step implementation for running a command on a remote machine over SSH. It supports merging in various variables about the build (such as the commit hash / revision ID, repository call sign, version control type and clone URI).
Test Plan: Configured a build plan to run `/bin/true` on localhost and the build passed. Configured a build plan to run `/bin/false` on localhost and the build failed.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley
CC: Korvin, epriestley, aran
Maniphest Tasks: T1049
Differential Revision: https://secure.phabricator.com/D7519
