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refs #230

Conflicts:
	src/libknot/dnssec/zone-events.c

- This way, no magic has to be used and it's ready for a possibility of configurable refresh
- Also, a possible inconstency was fixed.

Refs #219

CID #1121877

ref #226

Conflicts:
	src/libknot/dnssec/zone-keys.c

Reduce the scanner.c generation complexity by removing the sed #line removal, it needs to be done only for pre-generated files (scanner.c.{g0,g2})

resolves #221

- Normally not needed, but users can change signature lifetime after the
  server starts, so replan might be needed.

refs #219