Summary:
Ref T1049. This is very minimal, but does what it says.
I merged the variable replacement code so Remote + HTTP can share more stuff.
Test Plan:
Ran "HTTP" and "Remote" build plans.
{F79886}
{F79887}
Reviewers: hach-que, btrahan
Reviewed By: hach-que
CC: zeeg, aran
Maniphest Tasks: T1049
Differential Revision: https://secure.phabricator.com/D7541
