app/gerrit: import OAuth provider and add SSO support

This change:

 - imports gerrit-oauth-provider from upstream
 - adds sso.hackerspae.pl support to it

Change-Id: I92e7053614a9297bf1ced3aac044c0002acd836a
diff --git a/app/gerrit/gerrit-oauth-provider/tools/bzl/maven_jar.bzl b/app/gerrit/gerrit-oauth-provider/tools/bzl/maven_jar.bzl
new file mode 100644
index 0000000..35ea8ce
--- /dev/null
+++ b/app/gerrit/gerrit-oauth-provider/tools/bzl/maven_jar.bzl
@@ -0,0 +1,3 @@
+load("@com_googlesource_gerrit_bazlets//tools:maven_jar.bzl", _maven_jar = "maven_jar")
+
+maven_jar = _maven_jar