Restore IR CentOS 7 support based on Python 3.6

Change-Id: I95dbc9c24f0e217d55e1ab4d4478bfbb2a885f9e

bindep.txt

@@ -14,7 +14,6 @@ python3-devel [platform:redhat]
 python3-libselinux [platform:redhat]
 python3-setuptools [platform:redhat]
 python3-wheel [platform:redhat]
-python3-virtualenv [platform:redhat]
 readline-devel [platform:redhat]
 sqlite-devel [platform:redhat]
 zlib-devel [platform:redhat]

zuul.d/infrared.yaml

@@ -25,6 +25,19 @@
       zuul_work_dir: "{{ zuul.projects['opendev.org/x/tobiko'].src_dir }}"
 
 
+- job:
+    name: tobiko-tox-infrared-centos-7
+    parent: tobiko-tox-infrared
+    nodeset: centos-7-2-node
+    voting: false
+    description: |
+      Run test cases using tobiko infrared plugin on CentOS 7
+    vars:
+      tox_environment:
+        # This patchset fixes installing IR on CentOS 7 and Python 3.6
+        IR_DEPS: "git+https://review.gerrithub.io/redhat-openstack/infrared@refs/changes/15/493715/3"
+
+
 - job:
     name: tobiko-tox-infrared-centos-8
     parent: tobiko-tox-infrared

zuul.d/project.yaml

@@ -17,6 +17,7 @@
         - tobiko-devstack-functional-centos-8
         - tobiko-devstack-functional-ubuntu-bionic
         - tobiko-devstack-faults-centos-8
+        - tobiko-tox-infrared-centos-7
         - tobiko-tox-infrared-centos-8
         - tobiko-tox-infrared-ubuntu-bionic
         - tobiko-tox-infrared-ubuntu-focal