WIP: fix_symbol_link

[brianhu2006]

• this (/opt/openstack/current) is directory, this check(current.stat.islnk) may be not appropriate
• when update package-version, /opt/openstack/current still point to old package version

Maybe this role current_symlink should be deleted from site.yml and deploying via upgrade.yml( or site.yml --extra-vars=upgrade=true) instead of site.yml when have package version change

# OPENSTACK SERVICES
# # this next play can go away after 2.1.0+ is everywhere
- name: deal with current symlink
  hosts: all:!vyatta-*
  any_errors_fatal: true
  gather_facts: false
  roles:
    - role: current_symlink
      tags:
        - openstack
        - symlink
  environment: "{{ env_vars|default({}) }}"

[nirajdp76]

please add description stating what is the problem this pr is addressing. This role worked fine for a long time so am curious to see what issue we trying to address.