Display the sha1 of each branch for all relevant projects in ssh

Having the ability to know the sha1 of a branch for all projects in
gerrit can make an automatic build server more efficient so as to not
resync the projects that it already has.

This change adds an optional '--show-branch' argument to gerrit
ls-projects that can be used to specify a branch name. The revision of
that branch will be displayed next to the name of the project in the
list returned by the command.

Change-Id: Iaf662fb1d46e640a88a7e1dbb68f0f4052defe4c

Documentation/cmd-ls-projects.txt

diff --git a/Documentation/cmd-ls-projects.txt b/Documentation/cmd-ls-projects.txt
index 02c03ae..1200e18 100644
--- a/Documentation/cmd-ls-projects.txt
+++ b/Documentation/cmd-ls-projects.txt
@@ -8,7 +8,7 @@
 SYNOPSIS
 --------
 [verse]
-'ssh' -p <port> <host> 'gerrit ls-projects'
+'ssh' -p <port> <host> 'gerrit ls-projects' [\--show-branch <BRANCH>]
 
 DESCRIPTION
 -----------
@@ -26,6 +26,12 @@
 ---------
 This command is intended to be used in scripts.
 
+OPTIONS
+-------
+\--show-branch::
+\-b::
+	Name of the branch for which the command will display the sha of each project.
+
 EXAMPLES
 --------