Add security group commands

* Add security group: create, delete, list, set, show
* Add server: add secgroup, remove secgroup
* Add security group rule: create, delete, list
* Add Oslo's strutils and gettextutils

* Adds parseractions.RangeAction() to handle option arguments of either a single number
  or a range of numbers: '--port 25'  or '--port 1024:65535'

Blueprint: nova-client

Change-Id: Iad2de1b273ba29197709fc4c6a1036b4ae99725f
Merge "Add security group commands"