Remove python3-devel package from RHEL-7 bindeps

This allows running InfraRed jobs against RHEL-7 hosts
Test cases are going anyway to fail because python3-devel
is actually required by Tobiko python dependencies.
Romoving this package from dependencies helps fixing
other issues before package lack is solved.

Change-Id: I47aeae358652a7ee5618d8cec9dae01f872f5c40

bindep.txt

@@ -10,7 +10,7 @@ libffi-devel [platform:redhat]
 make [platform:redhat]
 openssl-devel [platform:redhat]
 python3 [platform:redhat]
-python3-devel [platform:redhat]
+python3-devel [platform:redhat !platform:rhel-7]
 python3-libselinux [platform:redhat]
 python3-setuptools [platform:redhat]
 python3-wheel [platform:redhat]

roles/tests/vars/test-RedHat-7.yaml

@@ -0,0 +1,5 @@
+---
+
+# This InfraRed patchset is required to workaround missing SE Linux Python 3 bindings
+#  https://review.gerrithub.io/c/redhat-openstack/infrared/+/493715
+ir_deps: "git+https://review.gerrithub.io/redhat-openstack/infrared@refs/changes/15/493715/5"

roles/tobiko-ensure-python3/vars/RedHat-7.yaml

@@ -0,0 +1,7 @@
+---
+
+python_packages:
+  python3:
+    - python3
+  python3.6:
+    - python36