Override tox job timeouts

Currently our unit tests frequently hit the 40 minute timeout due to the
inefficiency of the protection unit tests. As a temporary workaround,
this change overrides the zuul tox jobs with a 60 minute timeout.
Overriding the values of jobs that are defined elsewhere in a project
template isn't exactly documented but it supposedly works[1].

[1] http://eavesdrop.openstack.org/irclogs/%23openstack-infra/%23openstack-infra.2019-09-06.log.html#t2019-09-06T23:35:57

Change-Id: I0b9e0fbbd1760fe2d55935592f4349f337801209

.zuul.yaml

@@ -160,6 +160,15 @@
       - release-notes-jobs-python3
     check:
       jobs:
+        # Override tox timeouts
+        - openstack-tox-py37:
+            timeout: 3600
+        - openstack-tox-py36:
+            timeout: 3600
+        - openstack-tox-py27:
+            timeout: 3600
+        - openstack-tox-cover:
+            timeout: 3600
         - keystone-dsvm-functional:
             irrelevant-files: &irrelevant-files
               - ^.*\.rst$
@@ -202,6 +211,15 @@
             irrelevant-files: *tempest-irrelevant-files
     gate:
       jobs:
+        # Override tox timeouts
+        - openstack-tox-py37:
+            timeout: 3600
+        - openstack-tox-py36:
+            timeout: 3600
+        - openstack-tox-py27:
+            timeout: 3600
+        - openstack-tox-cover:
+            timeout: 3600
         - keystone-dsvm-functional:
             irrelevant-files: *irrelevant-files
         - keystone-dsvm-py3-functional: