Update aio job to use become and fix environment

The in-tree job definition did not pass the legacy ZUUL environment
into sudo or dump the ZUUL_ prefixed vars into zuul.env, so the
get-ansible-role-requirements script did not detect that it should
use Zuul provided sources when available.

This fixes the job definition in several ways:
1) The job definition no longer calls gate-check-commit using the
   sudo command. Instead become/become_user are placed on the task
   so ansible will handle the sudoing and we just call
   gate-check-commit directly now.

2) The zuul legacy environment is removed from the job environment.
   Only ZUUL_PROJECT is used in the integrated repo[1], so that is
   the only var we define now, and we do not need anything special to
   pass it into gate-check-commit since it is no longer running in
   a sudo wrapper.

As a result of these changes, the zuul.env loading code is removed
from gate-check-commit.

[1] c3ce038737/tests/get-ansible-role-requirements.yml (L57)

Change-Id: Id0fb8502029e3f996d2557bc09c3314cc884bba8

scripts/gate-check-commit.sh

@@ -95,19 +95,6 @@ if [ -n "${DATA_DISK_DEVICE}" ]; then
   export BOOTSTRAP_OPTS="${BOOTSTRAP_OPTS} bootstrap_host_data_disk_device=${DATA_DISK_DEVICE}"
 fi
 
-# Grab all the zuul environment variables that
-# were exported by the jenkins user into a file.
-# This is used for cross-repo testing.
-if [ -f zuul.env ]; then
-  # The ZUUL variables we get in the file are
-  # not quoted, so we change the file to ensure
-  # that they are. We also ensure that each
-  # var is exported so that it's accessible in
-  # any subshell.
-  sed -i 's|\(.*\)=\(.*\)$|export \1="\2"|' zuul.env
-  source zuul.env
-fi
-
 # Bootstrap Ansible
 source "${OSA_CLONE_DIR}/scripts/bootstrap-ansible.sh"
 

zuul.d/playbooks/run.yml

@@ -1,7 +1,12 @@
 - hosts: all
   tasks:
     - name: Run gate-check-commit.sh script
-      command: "sudo scripts/gate-check-commit.sh {{ scenario }} {{ action }}"
+      become: yes
+      become_user: root
+      command: "scripts/gate-check-commit.sh {{ scenario }} {{ action }}"
       args:
         chdir: "src/{{ zuul.project.canonical_name }}"
-      environment: '{{ zuul | zuul_legacy_vars }}'
+      environment:
+        # ZUUL_PROJECT is used by tests/get-ansible-role-requirements to
+        # determine when CI provided repos should be used.
+        ZUUL_PROJECT: "{{ zuul.project.short_name }}"