Support for dynamic master in maps

Resolves #403.
Add OpenStack option to ignore private CIDR
Allow OPENSTACK.ignore_cidr with IPv6
Add netaddr to requirements.txt
Revert "Add netaddr to requirements.txt"

This reverts commit 58606a55deb052d1d3757273a83917b29b1a7e86.
Back out change to Debian control file
Back out change to man page
Note netaddr dep and ignore_ip_addr opt
Don't require volumes option
Merge branch 'openstack-ignore_cidr' of https://github.com/boltronics/salt-cloud into boltronics-openstack-ignore_cidr
Make netaddr an optional dependency
Merging #432, fixing minion dict
Merge branch 'develop' of github.com:saltstack/salt-cloud into develop