Changed prefix of all dnslib functions to knot_

src/dnslib/changesets.c

src/dnslib/changesets.h

src/dnslib/consts.h

src/dnslib/debug.c

src/dnslib/debug.h

src/dnslib/descriptor.c

src/dnslib/descriptor.h

src/dnslib/dname-table.c

src/dnslib/dname-table.h

src/dnslib/dname.c

src/dnslib/dname.h

src/dnslib/dnslib-error.c

src/dnslib/edns.c

src/dnslib/edns.h

src/dnslib/error.h

src/dnslib/hash/cuckoo-hash-table.c

src/dnslib/hash/universal-system.c

src/dnslib/name-server.c

src/dnslib/name-server.h

src/dnslib/node.c