maxscale_getline moved to config.c

As a general purpose function should be somewhere else, but we
need to sort out what should be where first.

utils/skygw_utils.h

@@ -281,7 +281,6 @@ char* replace_quoted(const char* str);
 bool is_valid_posix_path(char* path);
 bool strip_escape_chars(char*);
 int simple_str_hash(char* key);
-int maxscale_getline(char** dest, int* size, FILE* file);
 
 EXTERN_C_BLOCK_END