move libknot/nameserver into knot/nameserver

Knot.files

src/Makefile.am

src/knot/ctl/remote.c

src/knot/nameserver/axfr.c

src/knot/nameserver/axfr.h

src/knot/nameserver/chaos.c

src/knot/nameserver/chaos.h

src/knot/nameserver/internet.c

src/knot/nameserver/internet.h

src/knot/nameserver/ixfr.c

src/knot/nameserver/ixfr.h

src/knot/nameserver/name-server.c

src/knot/nameserver/name-server.h

src/knot/nameserver/ns_proc_query.c

src/knot/nameserver/ns_proc_query.h

src/knot/nameserver/nsec_proofs.c

src/knot/nameserver/nsec_proofs.h

src/knot/nameserver/update.c

src/knot/nameserver/update.h

src/knot/server/notify.c