Bug 1098406: Fix gaia repository path r=garndt.

A commit in the mozilla-central repository [1] broke the gaia URL
repository URL construction code.

We now make sure our code works independent of the leading slash
presence.

[1] http://hg.mozilla.org/mozilla-central/rev/f3782f5c2710

--HG--
extra : rebase_source : b9266befc06d3566c22dc68581550ac8da798947
extra : source : 24b368aaa3cb6baff2f7de260d66d2719de63019

testing/docker/builder/VERSION

@@ -1 +1 @@
-0.0.21
+0.0.22

testing/docker/builder/bin/build-b2g-desktop.sh

@@ -26,7 +26,7 @@ fi
 ### Pull and update gaia
 cd $gaia_dir
 GAIA_REV=$(get_gaia_revision.js)
-GAIA_REPO="https://hg.mozilla.org$(get_gaia_repo.js)"
+GAIA_REPO="$(get_gaia_repo.js)"
 hg pull -r $GAIA_REV $GAIA_REPO;
 hg update $GAIA_REV;
 

testing/docker/builder/bin/get_gaia_repo.js

@@ -1,4 +1,7 @@
 #! /usr/bin/env node
 var fs = require('fs');
+var url = require('url');
 var data = fs.readFileSync('/home/worker/mozilla-central/source/b2g/config/gaia.json');
-console.log(JSON.parse(data).repo_path);
+
+var repo_path = JSON.parse(data).repo_path;
+console.log(url.resolve('https://hg.mozilla.org', repo_path));