Fix stable gate

This is a combination of 2 commits.

==========

Make our py2 func tests more explicitly py2

...because otherwise, I think they might be running under py3 right now.

(cherry picked from commit c512574e11)

----------

pin lower-constraints to run against python 2.7

(cherry picked from commit 281ffab2a5)

==========

Change-Id: I4e7e71cbaeda9e6bfcf4e415dd5f859df4835376
(cherry picked from commit 56ae0c7deb)

.zuul.yaml

@@ -42,7 +42,7 @@
       bindep_profile: test py35
 
 - job:
-    name: swift-tox-func
+    name: swift-tox-func-py27
     parent: swift-tox-base
     description: |
       Run functional tests for swift under cPython version 2.7.
@@ -54,12 +54,12 @@
       tox_envlist: func
 
 - job:
-    name: swift-tox-func-centos-7
-    parent: swift-tox-func
+    name: swift-tox-func-py27-centos-7
+    parent: swift-tox-func-py27
     nodeset: centos-7
 
 - job:
-    name: swift-tox-func-encryption
+    name: swift-tox-func-encryption-py27
     parent: swift-tox-base
     description: |
       Run functional tests for swift under cPython version 2.7.
@@ -71,12 +71,12 @@
       tox_envlist: func-encryption
 
 - job:
-    name: swift-tox-func-encryption-centos-7
-    parent: swift-tox-func-encryption
+    name: swift-tox-func-encryption-py27-centos-7
+    parent: swift-tox-func-encryption-py27
     nodeset: centos-7
 
 - job:
-    name: swift-tox-func-ec
+    name: swift-tox-func-ec-py27
     parent: swift-tox-base
     description: |
       Run functional tests for swift under cPython version 2.7.
@@ -89,12 +89,12 @@
       tox_envlist: func-ec
 
 - job:
-    name: swift-tox-func-ec-centos-7
-    parent: swift-tox-func-ec
+    name: swift-tox-func-ec-py27-centos-7
+    parent: swift-tox-func-ec-py27
     nodeset: centos-7
 
 - job:
-    name: swift-tox-func-domain-remap-staticweb
+    name: swift-tox-func-domain-remap-staticweb-py27
     parent: swift-tox-base
     description: |
       Run functional tests for swift under cPython version 2.7.
@@ -106,7 +106,7 @@
       tox_envlist: func-domain-remap-staticweb
 
 - job:
-    name: swift-tox-func-s3api
+    name: swift-tox-func-s3api-py27
     parent: swift-tox-base
     description: |
       Run functional tests for swift under cPython version 2.7.
@@ -174,11 +174,11 @@
       jobs:
         - swift-tox-py27
         - swift-tox-py35
-        - swift-tox-func
-        - swift-tox-func-encryption
-        - swift-tox-func-domain-remap-staticweb
-        - swift-tox-func-ec
-        - swift-tox-func-s3api
+        - swift-tox-func-py27
+        - swift-tox-func-encryption-py27
+        - swift-tox-func-domain-remap-staticweb-py27
+        - swift-tox-func-ec-py27
+        - swift-tox-func-s3api-py27
         - swift-probetests-centos-7
         - openstack-tox-lower-constraints
         - openstack-tox-pep8
@@ -209,11 +209,11 @@
       jobs:
         - swift-tox-py27
         - swift-tox-py35
-        - swift-tox-func
-        - swift-tox-func-encryption
-        - swift-tox-func-domain-remap-staticweb
-        - swift-tox-func-ec
-        - swift-tox-func-s3api
+        - swift-tox-func-py27
+        - swift-tox-func-encryption-py27
+        - swift-tox-func-domain-remap-staticweb-py27
+        - swift-tox-func-ec-py27
+        - swift-tox-func-s3api-py27
         - swift-probetests-centos-7
         - openstack-tox-lower-constraints
         - openstack-tox-pep8
@@ -243,9 +243,9 @@
     experimental:
       jobs:
         - swift-tox-py27-centos-7
-        - swift-tox-func-centos-7
-        - swift-tox-func-encryption-centos-7
-        - swift-tox-func-ec-centos-7
+        - swift-tox-func-py27-centos-7
+        - swift-tox-func-encryption-py27-centos-7
+        - swift-tox-func-ec-py27-centos-7
         - legacy-tempest-dsvm-neutron-pg-full:
             irrelevant-files:
               - ^(test-|)requirements.txt$

tox.ini

@@ -85,21 +85,25 @@ basepython = python2.7
 commands = ./.functests {posargs}
 
 [testenv:func-encryption]
+basepython = python2.7
 commands = ./.functests {posargs}
 setenv = SWIFT_TEST_IN_PROCESS=1
          SWIFT_TEST_IN_PROCESS_CONF_LOADER=encryption
 
 [testenv:func-domain-remap-staticweb]
+basepython = python2.7
 commands = ./.functests {posargs}
 setenv = SWIFT_TEST_IN_PROCESS=1
          SWIFT_TEST_IN_PROCESS_CONF_LOADER=domain_remap_staticweb
 
 [testenv:func-ec]
+basepython = python2.7
 commands = ./.functests {posargs}
 setenv = SWIFT_TEST_IN_PROCESS=1
          SWIFT_TEST_IN_PROCESS_CONF_LOADER=ec
 
 [testenv:func-s3api]
+basepython = python2.7
 commands = ./.functests {posargs}
 setenv = SWIFT_TEST_IN_PROCESS=1
          SWIFT_TEST_IN_PROCESS_CONF_LOADER=s3api
@@ -155,6 +159,7 @@ commands = sphinx-build -a -W -E -d releasenotes/build/doctrees -b html releasen
 # FIXME(dhellmann): We'll want to uncomment this
 # when the full test suite works with python 3.
 # basepython = python3
+basepython = python2.7
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt