Replace verbose and kernel quiet modes with silent and quiet

This patch replaces the verbose and kernel-quiet runtime options with
a (hopefully) more useful quiet and silent modes of operation.

By default Finit progressively shows all services it starts at boot, but
when boot has completed and services are started/restarted Finit prints
nothing.  If `--disable-quiet` is given all started/restared/stoppping
messages are shown even after boot.

However, if `--enable-silent` is given Finit is completely silent even
at boot, no progress is shown, until the first service is started, which
on most systems is login.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

plugin.c

@@ -304,7 +304,7 @@ int plugin_load_all(uev_ctx_t *ctx, char *path)
 	DIR *dp = opendir(path);
 	struct dirent *entry;
 
-	if (verbose)
+	if (!silent)
 		print_desc("Loading plugins", NULL);
 	if (!dp) {
 		_e("Failed, cannot open plugin directory %s: %s", path, strerror(errno));
@@ -326,7 +326,7 @@ int plugin_load_all(uev_ctx_t *ctx, char *path)
 	closedir(dp);
 #else
 	_d("Finit built statically, not loading plugins from %s ...", path);
-	if (verbose)
+	if (!silent)
 		print_desc("Initializing plugins", NULL);
 #endif	/* ENABLE_STATIC */
 
@@ -336,7 +336,7 @@ int plugin_load_all(uev_ctx_t *ctx, char *path)
 #ifndef ENABLE_STATIC
 exit:
 #endif
-	if (verbose)
+	if (!silent)
 		print_result(fail);
 
 	return fail;