Conditional switch to install compiler

Adds a conditional switch to install the compiler and python
development libraries. The switch is enabled by default to
preserve the old behavior.

Change-Id: If484e14a49c97467a38f9ab6e4b0e3351f60d4ed

defaults/main.yml

@@ -35,7 +35,12 @@ pip_source_install_options: ""
 # The URL/path of a constraints file to use when installing the additional pip packages.
 #pip_install_upper_constraints: "http://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt"
 
-pip_install_distro_packages: []
+pip_install_distro_packages: "{{ pip_install_build_packages | ternary(pip_install_distro_build_packages, []) }}"
+pip_install_distro_build_packages: []
+
+# Some pip installations require the system to have a compiler present
+# Toggling this will install a compiler and python-dev libraries to the host
+pip_install_build_packages: yes
 
 # This list var can be used to specify specific versions of pip, setuptools,
 # wheel and any other packages which must be installed when pip installs.

releasenotes/notes/compiler-packages-e110cafb5a69471e.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - A new switch ``pip_install_build_packages`` is introduced to allow toggling
+    compiler and development library installation. The legacy behavior of
+    installing the compiler and development libraries is maintained as the
+    switch is enabled by default.

vars/redhat-7.yml

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-pip_install_distro_packages:
+pip_install_distro_build_packages:
   - gcc
   - libffi-devel
   - openssl-devel

vars/ubuntu-14.04.yml

@@ -13,12 +13,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-pip_install_distro_packages:
+pip_install_distro_build_packages:
   - build-essential
   - python-setuptools
   - libffi-dev
   - libssl-dev
   - python-dev
+  - python3-dev
   - python-openssl
   - python-pyasn1
 

vars/ubuntu-16.04.yml

@@ -12,3 +12,14 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+pip_install_distro_build_packages:
+  - build-essential
+  - python-dev
+  - python-setuptools
+  - libffi-dev
+  - libssl-dev
+  - python-dev
+  - python3-dev
+  - python-openssl
+  - python-pyasn1