using right macros in sscanf

fixes #29
applied ofp_desc statistics fix also to OpenFlow 1.2, adjusted class cofdescstats in order to avoid eBadVersion exceptions for ofp_desc.dp_desc
Merge remote-tracking branch 'origin/devel-0.4' into devel-0.5

Conflicts:
	src/rofl/common/cmacaddr.cc
Merge remote-tracking branch 'origin/devel-0.5' into devel-0.6