Currently App catalog with Glare will not allow
to log in if memcached service is not running.
Other minor changes to get rid of lintian warnings.
Add retries to assets import due to timeouts from time
to time.
spec/acceptance/nodesets/ :
- nodepool-centos7.yml :
* Make host file compatible with beaker-hostgenerator 1.x
- nodepool-xenial.yml :
* Add host file for Xenial.
Change-Id: Id5466d346b2fd3e67bb8d0c3a9e5f6ad9d586b45
dd854d9988