gen_builtin_packing_tests.py PEP8 compliance

A few errors according to the pep8 tool were left behind.
1255-1257: I believe these to be false positives, my reading of PEP 8
		   makes them seem correct, and the tool does not complain about
		   other similar lines
247, 392: These are part of a mako template that is embedded in the
		  python file. A better solution than wrapping them would be to
		  split them out of the python and put them in their own mako
		  files.
gen_texture_query_lod_tests.py: PEP8 compliance
gen_non-lvalue_tests.py: PEP8 compliance
gen_interpolation_tests.py: PEP8 compliance
generate-cl-int-builtins.py: PEP8 compliance
gen_constant_array_size_tests.py: PEP8 compliance
gen_builtin_uniform_tests.py: PEP8 compliance