Fix Bazaar SSH/SFTP support.
Review Request #2106 — Created Feb. 6, 2011 and submitted
Fix Bazaar SSH/SFTP support. Bazaar's BZR_SSH environment variable doesn't just accept any arbitrary path. It requires some known, registered value. An "SSH Vendor," as they call it. We now register rbssh as such a vendor, and serialize the parameters sent to it. This supports sftp and ssh-backed repositories.
Verified that SSH works on both Windows and Linux. SFTP works on Linux, but not Windows. This is not our fault, but rather a breakage of bzr on Windows. OpenSSH has the same problem. The communication works fine, but the process never terminates because the pipes are never closed.