Syntax changes for use of pip_install

Syntax changes for consistency as follows:
- Change parameter=value syntax to parameter: value in
pip_install.yml
- Change "== false" to "| bool == false", also for
consistency.

Change-Id: I728b44243910c7c5556df529e1a3291655903883

playbooks/roles/bifrost-ironic-install/tasks/pip_install.yml

@@ -14,11 +14,12 @@
 # limitations under the License.
 ---
 - name: "Install {{ package }} package from pip"
-  pip: name="{{ package }}"
-       state="{{ state | default(omit) }}"
-       version="{{ version | default(omit) }}"
-       virtualenv="{{ virtualenv | default(omit) }}"
-  when: source_install is not defined or source_install == false
+  pip:
+    name: "{{ package }}"
+    state: "{{ state | default(omit) }}"
+    version: "{{ version | default(omit) }}"
+    virtualenv: "{{ virtualenv | default(omit) }}"
+  when: source_install is not defined or (source_install | bool == false)
 # NOTE (cinerama): We should be able to use the pip module here and
 # possibly merge these two tasks when
 # https://github.com/ansible/ansible-modules-core/pull/2600 lands.