Remove pip from packages installed

None of the hosts need pip installed any more. Everything
installed on the host is now a distribution package, and
all pip packages are inside a virtualenv. As such, this
role does not need to install pip/setuptoools/wheel any
more.

Depends-On: https://review.openstack.org/589633
Change-Id: I4ea7c5eaf3ad1874c16bfc72b5a13f7f3c7986a9

vars/suse.yml

@@ -58,10 +58,8 @@ openstack_host_kernel_modules:
 
 ## Base packages
 _openstack_host_distro_packages:
-  - python-pip
-  - python-setuptools
+  - python-setuptools # python-virtualenv does not work without this package
   - python-virtualenv
-  - python-wheel
 
 ## Bare metal base packages
 _openstack_host_metal_distro_packages:

vars/ubuntu-16.04.yml

@@ -49,14 +49,8 @@ openstack_host_kernel_modules:
 
 ## Base packages
 _openstack_host_distro_packages:
-  - python-pip
-  - python3-pip
-  - python-setuptools
-  - python3-setuptools
-  - python-virtualenv
   - python3-virtualenv
-  - python-wheel
-  - python3-wheel
+  - python-virtualenv
   - virtualenv
 
 ## Bare metal base packages

vars/ubuntu-18.04.yml

@@ -49,14 +49,8 @@ openstack_host_kernel_modules:
 
 ## Base packages
 _openstack_host_distro_packages:
-  - python-pip
-  - python3-pip
-  - python-setuptools
-  - python3-setuptools
   - python-virtualenv
   - python3-virtualenv
-  - python-wheel
-  - python3-wheel
   - virtualenv
 
 ## Bare metal base packages