config: move getopt out of main()

This moves the whole getopt setup and analysis out of main() into its
own function in config.c.

The main motivation for this change is to be able to call getopt parsing
and configuration file parsing also from the RPC code path.

In one of the discussion emails about configuration files in CLI and RPC
mode the following architecture was proposed:

apply_config(global_conf)
apply_config(user_conf)
apply_config(pre_conf)
parse_command_line()
apply_rpc_options()
apply_config(post_conf)

And especially for the last step the getopt parsing needs to be out of
main() and callable from the RPC code path.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/include/cr_options.h

 #ifndef __CR_OPTIONS_H__
 #define __CR_OPTIONS_H__
 
+#include <sys/types.h>
 #include <stdbool.h>
 #include "common/config.h"
 #include "common/list.h"
@@ -121,10 +122,14 @@ struct cr_options {
 	int			weak_sysctls;
 	int			status_fd;
 	bool			orphan_pts_master;
+	pid_t			tree_id;
+	int			log_level;
+	char			*imgs_dir;
 };
 
 extern struct cr_options opts;
 
-extern void init_opts(void);
+extern int parse_options(int argc, char **argv, bool *usage_error, bool *has_exec_cmd);
+extern void init_opts();
 
 #endif /* __CR_OPTIONS_H__ */

criu/include/crtools.h

@@ -32,10 +32,6 @@ extern int cr_lazy_pages(bool daemon);
 extern int check_add_feature(char *arg);
 extern void pr_check_features(const char *offset, const char *sep, int width);
 
-extern int init_config(int argc, char **argv,
-		       int *global_cfg_argc, int *user_cfg_argc,
-		       bool *usage_error);
-
 #define PPREP_HEAD_INACTIVE	((struct pprep_head *)-1)
 
 #define add_post_prepare_cb_once(phead) do {		 \