Fix get Floating ip pools action name to match with its policy

Get Floating IP Pools is always responding 403 (Forbidden) cause its method
name, which is also being used as action name, doesn't match with the name in
policy.json file.
I opted for this approach cause it also fixes the different names between the
extension (which is named floating **ip** pools instead of floating pools) and
the backend.
Another good practice would be change the default_floating_pool option to
default_float_ip_pool, but that would require change the conf file and possibly
break some compatibility.

Fixes bug 1091668

Change-Id: I2627e8b0f45c5c39bbbf1a4a12b448e1992fa4b4
Merge "Fix get Floating ip pools action name to match with its policy"