Add branches arg to createProject

This new functiona argument will allow callers to set the default
project branch on repo creation. It takes a list, all branches will be
created with the first being repo HEAD.

Change-Id: Iae5a71662740678e663bcd73d6ac660559db5d9a

.zuul.yaml

@@ -1,6 +1,7 @@
 - job:
     name: gerritlib-jeepyb-integration
     description: Run manage_projects with gerritlib from source against Gerrit
+    pre-run: playbooks/jeepyb-integration/pre.yaml
     run: playbooks/jeepyb-integration/run.yaml
     post-run: playbooks/jeepyb-integration/post.yaml
     required-projects:

gerritlib/gerrit.py

@@ -257,7 +257,7 @@ class Gerrit(object):
         self._setMember('remove', group, member)
 
     def createProject(self, project, require_change_id=True, empty_repo=False,
-                      description=None):
+                      description=None, branches=None):
         cmd = 'gerrit create-project'
         if require_change_id:
             cmd = '%s --require-change-id' % cmd
@@ -266,6 +266,10 @@ class Gerrit(object):
         if description:
             cmd = "%s --description \"%s\"" % \
                   (cmd, description.replace('"', r'\"'))
+        if branches:
+            # Branches should be a list. The first entry will be repo HEAD.
+            for branch in branches:
+                cmd = "%s --branch \"%s\"" % (cmd, branch)
         version = None
         try:
             version = self.parseGerritVersion(self.getVersion())

playbooks/jeepyb-integration/pre.yaml

@@ -0,0 +1,3 @@
+- hosts: all
+  roles:
+    - name: ensure-pip

tools/projects.yaml

@@ -10,6 +10,7 @@
   acl-config: tools/acls/test/test.config
   groups:
     - testing
+  default-branch: main
 - project: test/test-repo-3
   description: A retired repo
   acl-config: tools/acls/test/retired.config