Replaced all usages of name 'CuteDNS' by 'knot'

CodingStyle

Knot.files

src/conf/conf.c

src/conf/conf.h

src/conf/cutedns.conf.example

src/conf/logconf.h

src/dnslib/zone-dump.c

src/dnslib/zone-load.c

src/tests/conf_tests.c

src/tests/files/sample_conf