Readjust job timeouts

With the protection tests split out, the regular unit tests mostly
shouldn't reach the 40 minute timeout limit unless they are extremely
unlucky, so remove those overrides.

The protection tests themselves are still extremely expensive even when
split out from the rest of the tests, so bump their timeout to an hour.

Change-Id: I247478f998d7fb84c486cc04a3040517721e0dd3

.zuul.yaml

@@ -71,6 +71,7 @@
 - job:
      name: keystone-tox-protection
      parent: openstack-tox-py37
+     timeout: 3600
      vars:
        tox_envlist: protection
        bindep_profile: test py37
@@ -168,17 +169,6 @@
       - release-notes-jobs-python3
     check:
       jobs:
-        # Override tox timeouts
-        - openstack-tox-py37:
-            timeout: 5400
-        - openstack-tox-py36:
-            timeout: 5400
-        - openstack-tox-py27:
-            timeout: 5400
-        - openstack-tox-cover:
-            timeout: 5400
-        - openstack-tox-lower-constraints:
-            timeout: 5400
         - keystone-dsvm-functional:
             irrelevant-files: &irrelevant-files
               - ^.*\.rst$
@@ -222,15 +212,6 @@
         - keystone-tox-protection
     gate:
       jobs:
-        # Override tox timeouts
-        - openstack-tox-py37:
-            timeout: 5400
-        - openstack-tox-py36:
-            timeout: 5400
-        - openstack-tox-py27:
-            timeout: 5400
-        - openstack-tox-lower-constraints:
-            timeout: 5400
         - keystone-dsvm-functional:
             irrelevant-files: *irrelevant-files
         - keystone-dsvm-py3-functional: