Replace config/project repos with config/untrusted projects

The config-repo / project-repo terminology is confusing and we've
generally been using trusted-project and untrusted-project instead.
The term "untrusted-project" is straightforward, but "trusted-project"
is a little misleading, since there are other characteristics which
define it (notably, that the configuration held in it is branchless).
A better term for that might be "config-project".

Since the main config now directly refers to projects rather than
repos, complete the transition by replacing all config-repo
occurances with config-project and likewise project-repo with
untrusted-project.

Change-Id: I2341aa94e3622e2647b0506b78bc84dbcdec1901
Story: 2000953
diff --git a/tests/unit/test_git_driver.py b/tests/unit/test_git_driver.py
index 9c7ebb1..1cfadf4 100644
--- a/tests/unit/test_git_driver.py
+++ b/tests/unit/test_git_driver.py
@@ -27,10 +27,10 @@
         tenant = self.sched.abide.tenants.get('tenant-one')
         # Check that we have the git source for common-config and the
         # gerrit source for the project.
-        self.assertEqual('git', tenant.config_repos[0].source.name)
-        self.assertEqual('common-config', tenant.config_repos[0].name)
-        self.assertEqual('gerrit', tenant.project_repos[0].source.name)
-        self.assertEqual('org/project', tenant.project_repos[0].name)
+        self.assertEqual('git', tenant.config_projects[0].source.name)
+        self.assertEqual('common-config', tenant.config_projects[0].name)
+        self.assertEqual('gerrit', tenant.untrusted_projects[0].source.name)
+        self.assertEqual('org/project', tenant.untrusted_projects[0].name)
 
         # The configuration for this test is accessed via the git
         # driver (in common-config), rather than the gerrit driver, so