src: use FatalError whenever possible

src: use FatalError whenever possible

Replaces all patterns of SCLogError() followed by exit() with
FatalError(). Cocci script to do this:

@@
constant C;
constant char[] msg;
@@

- SCLogError(C,
+ FatalError(SC_ERR_FATAL,
  msg);
- exit(EXIT_FAILURE);

Closes redmine ticket 3188.