refs #2137

refs @2137

- strdup'd base64 string was not freed.
- key name DNAME was not freed in key freeing function.

- Using old free function for TSIG key - would not compile.

Conflicts:
	src/knot/ctl/knotc_main.c

refs #2137

Configure option --enable-fastscanner enables G2 FSM type.

Replace strcpy function with a strncpy.

Replace sprintf function with a snprintf.

Replace sprintf function with a snprintf.

Replace sprintf and strcpy functions with more secure variants.