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
Addresses issue https://github.com/saltstack/salt-cloud/issues/478.

Queries to list EC2 instances return a dict but could return a list for stopped instances. Need to hand both. See the issue cited above for example error messages in the log .
fixed indentation.
Add a cloud.profiles.d blurb
Merge pull request #491 from jesusaurus/docs

Add a cloud.profiles.d blurb
Fix a logic error.

While turning the loop inside out, a bug was introduced that would
only include the last security group $X times rather than including
all $X security groups.
Merge pull request #492 from jesusaurus/secgroup

Fix a logic error in the openstack security_group code.
Merge pull request #483 from toppur/master

EC2 instance provisioning is incomplete and does not set Name tag (https://github.com/saltstack/salt-cloud/issues/478)
Error out if somebody used "tag" instead of "tags"
Copy all options from the map to the profile
If an ssh key is used, don't bother trying a password
Add driver that only installs salt, on an existing machine