Work for milestone 9.2

Refactored the common code in filters except role router

Updated readme for DNS Filter and provided support for X-Forwarded-For

Updated the readme for DNS filter to note space delimited list

Modifying strategy code to pass keys

Refactored create_patch to TestBase

changed try_context to use imported strategies instead of coded ones

moved neutron context to wafflehaus.neutron

Added test to prove that {format} wildcards work with resource filters.
Merge pull request #41 from roaet/9.2

Work for milestone 9.2