[master] add missing rdata files and change some generated headers to nodist
Add missing libdns++ rdata files for the distribution (this fixes distcheck error). Change three generated libdns++ headers to "nodist" so they aren't included in the distribution (they were mistakenly included in last tarball). This fixes two immediate problems: If you do a distcheck build or create a tarball it would mistakenly include the rdataclass.h, rrclass.h, and rrtype.h headers. They are supposed to be generated at build time. Also the rp_17 rdata files were not included in the distribution, so building would fail because rdataclass didn't define the RP class. This update also includes the nsec_bitmap rdata files. (I didn't see any problem related to this, but I assume they were meant to be shipped.) I added two generated files to BUILT_SOURCES. Not necessarily required, but this implies that the target for these should be done before the regular build (so this makes sure the generated files are created). Discussed a little on jabber on Friday. This should fix the existing distcheck autobuilder failures.