Unify coding style

@sjaeckel integrated clang-format with formal coding style. Run his
script and commit changes.

There are pros and cons of this commit.

Mixed coding style is a "broken window". A good single style simplifies
reading and writing code.

On the other hand, this is a big change which will lead to conflicts.

tests/res_query_dump.c

@@ -55,8 +55,8 @@ int main(int argc, char **argv)
     }
 
     domain = argv[1];
-    snprintf(fulldomain, sizeof(fulldomain), "_%s._%s.%s",
-             service, proto, domain);
+    snprintf(fulldomain, sizeof(fulldomain), "_%s._%s.%s", service, proto,
+             domain);
     errno = 0;
     len = res_query(fulldomain, C_IN, T_SRV, buf, sizeof(buf));