Remove pip_install dependency

With addition of pip_install on every node, we don't
need to have pip_install as a meta dependency.

Depends-On: If3412bb888ebb854874bbc43eb76bfcb3e4a7868
Depends-On: I79ff70c438b44753be2a93f004ebbc46de0a963d
Change-Id: I8c4d59c198571e798bef32e727e89180345c4089

doc/source/index.rst

@@ -14,8 +14,12 @@ Default variables
    :language: yaml
    :start-after: under the License.
 
-Required variables
-~~~~~~~~~~~~~~~~~~
+Dependencies
+~~~~~~~~~~~~
+
+This role needs pip >= 7.1 installed on the target host.
+
+This role requires the following variables to be defined:
 
 .. code-block:: yaml
 

meta/main.yml

@@ -33,7 +33,6 @@ galaxy_info:
     - barbican
 
 dependencies:
-  - pip_install
   - role: apt_package_pinning
     when:
       - ansible_pkg_mgr == 'apt'