Harden test_crud tests

* Sometimes in a /24 subnet, picking a random ip for a port used to
choose an IP which is already created. So, use /16 subnet to be more
deterministic
* Use right variable in a log message
* Avoid deleting an already deleted object (router/subnet/port/network)
Merge remote-tracking branch 'upstream/master'
Provide Distro detail in the sanity test report

Populate report_details.ini with Distro as well as openstack release
info(havana/icehouse)
Merge pull request #148 from vedujoshi/master

Harden test_crud tests