pyloxi: trim blacklist
pyloxi: use LOXI IR for classes
pyloxi: use IR to generate enums
openflow_input: fix padding fields of new messages
py_gen: support embedding of_bsn_vport_q_in_q_t

Obviously oftype.py should figure this out automatically. Maybe when we create
a better representation of types than C strings this will be easier.
py_gen: make constant_for_value use the IR
py_gen: remove unused util code
generate pyloxi documentation using sphinx
Merge remote-tracking branch 'origin/master' into pyloxi-ir

Conflicts:
	py_gen/oftype.py
pyloxi: move OFType logic out of code and into a table

This is easier to understand, but results in duplication which will be fixed in
the next commit.

Support for arrays was removed because apparently we don't use them anymore.
pyloxi: add convenience code to generate most OFTypeData objects
pyloxi: move OFType interface functions to module level

This removes the need to replace the LOXI IR OFType object in members with our
own version. If/when the core OFType is upgraded to an inheritance hierachy we
won't need to duplicate it in pyloxi.
Merge into master from pull request #17:
Move PyLoxi onto the new IR (https://github.com/floodlight/loxigen/pull/17)