Ensure 0755 default mode on new directories

This patch ensures that all directories under `/openstack/venvs`
are created with `0755` permissions by default. This prevents
permission denied errors from occurring during `aodh-dbsync`.

Change-Id: Id3a26cf9dcab11119ee6ffc2c3edf8f42f8d16bc

tasks/aodh_install.yml

@@ -80,6 +80,7 @@
   file:
     path: "{{ aodh_bin | dirname }}"
     state: directory
+    mode: "0755"
   register: aodh_venv_dir
   when:
     - not aodh_developer_mode | bool

tasks/aodh_pre_install.yml

@@ -37,6 +37,7 @@
     group: "{{ item.group|default(aodh_system_group_name) }}"
     mode: "{{ item.mode|default('0755') }}"
   with_items:
+    - { path: "/openstack/venvs", mode: "0755", owner: "root", group: "root" }
     - { path: "/etc/aodh" }
     - { path: "{{ aodh_system_user_home }}" }
     - { path: "{{ aodh_system_user_home }}/.ssh", mode: "0700" }