Adapt 'owners' to the recent changes on Gerrit master

Since change I28f2dc7b7cb prolog related classes were moved to a
separate package. Therefore it is no longer possible to build 'owners'
plugin out of 'master' against all Gerrit versions since 'stable-3.6'.
As a result owners stable-3.6 was created out of 'master' and it is
used to build against 'stable-3.[6|7|8]' Gerrit version.

Change-Id: I034ee23d44e5d3fa3efa19579ab66d946524487c

jenkins/gerrit-bazel-plugin-owners.yaml

diff --git a/jenkins/gerrit-bazel-plugin-owners.yaml b/jenkins/gerrit-bazel-plugin-owners.yaml
index ed482ef..965a51d 100644
--- a/jenkins/gerrit-bazel-plugin-owners.yaml
+++ b/jenkins/gerrit-bazel-plugin-owners.yaml
@@ -69,14 +69,14 @@
           extra-plugins: ''
           targets: 'plugins/owners plugins/owners-a*'
           branch:
-            - master
+            - stable-3.6
           gerrit-branch:
             - stable-3.8
             - stable-3.7
-            - stable-3.6
       - 'plugin-owners-bazel-{branch}':
           extra-plugins: ''
           targets: 'plugins/owners plugins/owners-a*'
           branch:
             - master
+            - stable-3.6
             - stable-3.5