Bug 25101: Generate incremental mars for nightly builds

Update testsuite_git_commit so that incremental mars are generated
as part of our nightly builds.

tools/ansible/roles/tbb-nightly-build/defaults/main.yml

@@ -5,7 +5,7 @@ nightly_build_cron_minute: 20
 nightly_build_keep_builds: 3
 testsuite_dir: "/home/{{ nightly_build_user }}/tbb-testsuite"
 testsuite_git_url: https://git.torproject.org/tor-browser-bundle-testsuite.git
-testsuite_git_commit: d5e23151bf4ff48146c0c33355fe70def5e4d3f2
+testsuite_git_commit: ea0942f9da2bdbaf3f140f3baaed1bb56ee9af69
 nightly_build_wwwdir: "/home/{{ nightly_build_user }}/www"
 nightly_build_nginx_enable: true
 nightly_build_nginx_listen: 127.0.0.1:80