Make the the following imports lazy in test.support:
* bz2
* gzip
* lzma
* resource
* zlib
The following test.support decorators now need to be called
with parenthesis:
* @support.requires_bz2
* @support.requires_gzip
* @support.requires_lzma
* @support.requires_zlib
For example, "@requires_zlib" becomes "@requires_zlib()".