Don't claim to obfuscate passwords with master-side source step.

We don't currently have any way of obfuscating arbitrary things sent from the
master, so don't claim that we can.
Fixed try builds not being scheduled when more than one is pending
local hushp1pt change: stop displaying bogus e-mail addresses in web page headers

In our configuration, bogus email addresses are displayed for authenticated users in web status, like layout.html.
I've tried everything I can think of to configure correct e-mail addresses. No luck- so, just stop displaying it.
local hushp1pt change: do not force $PWD on (Windows) buildslave.  See http://trac.buildbot.net/ticket/456.

In our configuration, we run build slave on Windows, using Windows Python, without Cygwin.
But we run many ShellCommands using Cygwin (give the full Windows path to Cygwin's bash.exe in the command list).
Without this local change, bash's pwd returns the Windows PWD (C:\buildslave\something).
Unfortunately, our bash scripts need the traditional Cygwin pwd (/cygdrive/c/buildslave/something) to work right.
Repo build step can work with any Git branch (repo init -b), not just master.
Add config options to Gerrit change source to filter Gerrit events by project name and/or event type.
Repo build step parameter name should be default_manifest_branch instead of manifest_branch