VPP-223 Document vppinfra/bitmap.h
VPP-223 Document vppinfra/bitmap.h

Change-Id: I259a5b716bd8a7abdb0e6bf778432f034338ffdc
Signed-off-by: Dave Barach <bfcdf3e6ca6cef45543bfbb57509c92aec9a39fb@barachs.net>

GabrielGanne/vpp-flowtable,FDio/vpp,vpp-dev/vpp,chrisy/vpp,GabrielGanne/vpp-flowtable,milanlenco/vpp,chrisy/vpp,milanlenco/vpp,FDio/vpp,milanlenco/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,chrisy/vpp,FDio/vpp,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,milanlenco/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,milanlenco/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,milanlenco/vpp