Use strict language rules

Add the strict and warning pragmas informing the Python interpreter we
want to obey the language rules and catch as many errors for us as it
can.

Clean up all the errors that strict reported.

Properly define the scope of all identifiers and use correct import
semantics.

Initialize most global variables to undef so that we can catch the use
of those variables prior to their initialization with defined
values. Previously most had been initialized to the empty string,
which is a perfectly valid value, thus no warnings will be emitted if
they are used before being assigned a value of our choosing.

At this point all variables and functions will have been declared and
assigned reasonable values. We're now protected against things like
misspelled identifier names, silently using undefined values,
referencing things which don't exist, etc.


git-svn-id: svn+ssh://svn.fedorahosted.org/svn/pki/trunk@1571 c9f7a03b-bd48-0410-a16d-cbbf54688b0b

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