Make ready for split-controller testing in ansible-core (#3345) (#3413)

* Accept context/ in aliases.

* Mark ansible_galaxy_install test as context/controller.

* Fix interfaces_file test.

ci_complete

* Install pyone dependency.

ci_complete

(cherry picked from commit 98d071f61e)

tests/integration/targets/one_template/meta/main.yml

@@ -0,0 +1,2 @@
+dependencies:
+  - setup_opennebula

tests/integration/targets/setup_opennebula/meta/main.yml

@@ -0,0 +1,2 @@
+dependencies:
+  - setup_remote_constraints

tests/integration/targets/setup_opennebula/tasks/main.yml

@@ -0,0 +1,5 @@
+---
+- name: Install required library
+  pip:
+    name: pyone
+    extra_args: "-c {{ remote_constraints }}"

tests/sanity/extra/aliases.py

@@ -41,6 +41,8 @@ def main():
                     continue
                 if line.startswith('cloud/'):
                     continue
+                if line.startswith('context/'):
+                    continue
                 if line in ('unsupported', 'disabled', 'hidden'):
                     skip = True
                 if line in ('destructive', ):