Update Travis config for the removal of pulpcore-plugin

Required PR: pulp/pulpcore#347

re: #5580
ihttps://pulp.plan.io/issues/5580

example-source/group_vars/all

@@ -1,7 +1,6 @@
 ---
 pulp_default_admin_password: password
 pulp_source_dir: '/var/lib/pulp/devel/pulpcore'
-pulp_plugin_source_dir: "/var/lib/pulp/devel/pulpcore-plugin"
 pulp_install_plugins:
   pulp-file:
     source_dir: "/var/lib/pulp/devel/pulp_file"

molecule/source/prepare.yml

@@ -20,12 +20,6 @@
         dest: '{{ pulp_source_dir }}'
         update: yes
 
-    - name: Clone pulpcore-plugin repository
-      git:
-        repo: 'https://github.com/pulp/pulpcore-plugin.git'
-        dest: '{{ pulp_plugin_source_dir }}'
-        update: yes
-
     - name: Clone pulp_file repository
       git:
         repo: 'https://github.com/pulp/pulp_file.git'

roles/pulp/README.md

@@ -29,9 +29,6 @@ Role Variables:
 * `pulp_source_dir`: Optional. Absolute path to pulpcore source code. If
   present, pulpcore will be installed from source in editable mode. Also accepts
   a pip VCS URL, to (for example) install the master branch.
-* `pulp_plugin_source_dir`: Optional. Absolute path to pulpcore-plugin source
-  code. If present, pulpcore-plugin will be installed from source in editable
-  mode. Also accepts a pip VCS URL, to (for example) install the master branch.
 * `pulp_user`: User that owns and runs Pulp. Defaults to "pulp".
 * `pulp_user_id`: Integer value of uid for the `pulp_user`. Defaults to nothing and uid is assigned
   by the system.

roles/pulp/tasks/install.yml

@@ -177,19 +177,6 @@
       changed_when: result.changed and not pulp_pip_editable
       notify: Collect static content
 
-    - name: Install pulpcore-plugin package from source
-      pip:
-        name: '{{ pulp_plugin_source_dir }}'
-        editable: '{{ pulp_pip_editable }}'
-        state: present
-        virtualenv: '{{ pulp_install_dir }}'
-        virtualenv_command: '{{ pulp_python_interpreter }} -m venv'
-      when: pulp_plugin_source_dir is defined
-      # This is a hack. Editable pip installs are always changed, which fails molecule's
-      # idempotence test.
-      changed_when: result.changed and not pulp_pip_editable
-      notify: Collect static content
-
     - name: Install Pulp plugins via PyPI
       pip:
         name: '{{ item.key }}'