Support custom playbook locations

This change drops the playbooks/ location for pre and post playbooks
in any case and for main playbooks if the run argument is given.

That way the playbooks can be placed in arbitrary locations giving the
projects more flexibility how to structure their repo.

Change-Id: I84d42f9b293df716a7a0759c7127b6f705c075c2
diff --git a/tests/unit/test_model.py b/tests/unit/test_model.py
index 7a4d53e..f4ca96f 100644
--- a/tests/unit/test_model.py
+++ b/tests/unit/test_model.py
@@ -266,11 +266,11 @@
         self.assertEqual(len(nodes), 1)
         self.assertEqual(nodes[0].label, 'new')
         self.assertEqual([x.path for x in job.pre_run],
-                         ['playbooks/base-pre',
-                          'playbooks/py27-pre'])
+                         ['base-pre',
+                          'py27-pre'])
         self.assertEqual([x.path for x in job.post_run],
-                         ['playbooks/py27-post',
-                          'playbooks/base-post'])
+                         ['py27-post',
+                          'base-post'])
         self.assertEqual([x.path for x in job.run],
                          ['playbooks/python27',
                           'playbooks/base'])
@@ -294,15 +294,15 @@
         self.assertEqual(len(nodes), 1)
         self.assertEqual(nodes[0].label, 'old')
         self.assertEqual([x.path for x in job.pre_run],
-                         ['playbooks/base-pre',
-                          'playbooks/py27-pre',
-                          'playbooks/py27-diablo-pre'])
+                         ['base-pre',
+                          'py27-pre',
+                          'py27-diablo-pre'])
         self.assertEqual([x.path for x in job.post_run],
-                         ['playbooks/py27-diablo-post',
-                          'playbooks/py27-post',
-                          'playbooks/base-post'])
+                         ['py27-diablo-post',
+                          'py27-post',
+                          'base-post'])
         self.assertEqual([x.path for x in job.run],
-                         ['playbooks/py27-diablo']),
+                         ['py27-diablo']),
 
         # Test essex
         change.branch = 'stable/essex'
@@ -319,13 +319,13 @@
         job = item.getJobs()[0]
         self.assertEqual(job.name, 'python27')
         self.assertEqual([x.path for x in job.pre_run],
-                         ['playbooks/base-pre',
-                          'playbooks/py27-pre',
-                          'playbooks/py27-essex-pre'])
+                         ['base-pre',
+                          'py27-pre',
+                          'py27-essex-pre'])
         self.assertEqual([x.path for x in job.post_run],
-                         ['playbooks/py27-essex-post',
-                          'playbooks/py27-post',
-                          'playbooks/base-post'])
+                         ['py27-essex-post',
+                          'py27-post',
+                          'base-post'])
         self.assertEqual([x.path for x in job.run],
                          ['playbooks/python27',
                           'playbooks/base'])