Add retries to package installs (#88)

* Add retry guard around package installs to avoid locking

Both YUM and APT consistently display temporary locking when building via packer and ansible

  * retry usually only fires once anecdotally

* Changing to make style consistent with other roles

tasks/install.yml

@@ -3,6 +3,10 @@
   package:
     name: "{{ item }}"
     state: present
+  register: _install_dep_packages
+  until: _install_dep_packages is success
+  retries: 5
+  delay: 2
   with_items: "{{ node_exporter_dependencies }}"
 
 - name: Create the node_exporter group