Add galaxy-related options for Ansible provisioner

[dkasyanov]

Issue

• ansible provisioner missing galaxy fields that's available in Packer
• ansible-local has misspelled galaxy_command option

List of Changes Proposed

Ansible Provisioner:

• galaxy_file
• galaxy_command
• galaxy_force_install
• roles_path
• collections_path Upstream documentation: https://www.packer.io/docs/provisioners/ansible#galaxy_file

Ansible Local Provisioner:

• galaxy_command Upstream documentation: https://www.packer.io/docs/provisioners/ansible-local#galaxy_command

[coveralls]

Coverage remained the same at 100.0% when pulling 3b0aa76892374ad4c196409212f63ba699212fab on dkasyanov:master into 0d91aa397f27ffa4f57daeeaa8c0e6104cac2cb1 on mayn:master.