Drop confusing splash cmdline and --enable-progress configure option

This patch reverts back to the progress/status behavior of Finit < v3.0
because this is what most users expect, including the maintainer.  The
resulting code and configure script is a lot simpler to understand and
maintain:

- No more --enable-progress or --enable-progress-classic configure
  flags.  Instead a progress_style variable in helpers.c that can
  be changed at compile time for those that really need it.
- No more 'splash' kernel commnand line option.  This turned out to
  be *very* confusing to many users who believed it was some sort of
  graphical splash screen à la Plymouth.

Also, when Finit debug is enabled we now have a global 'debug' flag
which now alo controls if klogctl() should be called to prevent the
kernel logs to the console or not.

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

src/exec.c

@@ -172,7 +172,7 @@ int run_interactive(char *cmd, char *fmt, ...)
 
 	/* Redirect output from cmd to a tempfile */
 	fp = tempfile();
-	if (fp && !log_is_debug()) {
+	if (fp && !debug) {
 		oldout = dup(STDOUT_FILENO);
 		olderr = dup(STDERR_FILENO);
 		dup2(fileno(fp), STDOUT_FILENO);
@@ -183,7 +183,7 @@ int run_interactive(char *cmd, char *fmt, ...)
 	status = run(cmd);
 
 	/* Restore stderr/stdout */
-	if (fp && !log_is_debug()) {
+	if (fp && !debug) {
 		if (oldout >= 0) {
 			dup2(oldout, STDOUT_FILENO);
 			close(oldout);
@@ -198,7 +198,7 @@ int run_interactive(char *cmd, char *fmt, ...)
 		print_result(status);
 
 	/* Dump any results of cmd on stderr after we've printed [ OK ] or [FAIL]  */
-	if (fp && !log_is_debug()) {
+	if (fp && !debug) {
 		size_t len, written;
 
 		rewind(fp);