bug: move import findargspec out of Permission __init__ method We have a few places where imports are done inside a method/function. For methods that are called once it's not an issue but the Permissions __init__ method is called often and accounts for > 10% of the time in the __init__ function when looking at wsgi-lineprof output. So move it to the module level.

Python compatiblity TODO
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Remove support for Python versions < 2.7. As they are not supported anymore.