Add -defer-examine option to target create command

The '-defer-examine' option to target create allows declaring targets
that are present on the chain, but not fully functional.  They will
be skipped by the initial arp_examine as well as arp_examine after
reset.

Manual examine using 'arp_examine' is needed to examine them, with the
idea that some kind of actions is neeed to bring them to a state where
examine will succeed (if at all possible).

In order to allow value less options to target command, I had to relax
the goi.argc check in jim_target_configure().

Change-Id: I9bf4e8d27eb6476dd9353d15f48965a8cfd5c122
Signed-off-by: Esben Haabendal <esben@haabendal.dk>
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/3076
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/target/target.h

@@ -130,6 +130,9 @@ struct target {
 	struct jtag_tap *tap;				/* where on the jtag chain is this */
 	int32_t coreid;						/* which device on the TAP? */
 
+	/** Should we defer examine to later */
+	bool defer_examine;
+
 	/**
 	 * Indicates whether this target has been examined.
 	 *