jlogctl: fix getopt use

Before this change, jlogctl treates its argv[0] and options as filenames to attempt to open:

	$ ./jlogctl -d /tmp/vtc.49967.6b8b4567/vtc_jlog_foo
	./jlogctl
	error opening './jlogctl'
	-d
	error opening '-d'
	/tmp/vtc.49967.6b8b4567/vtc_jlog_foo
		00000000 [29 bytes] 0 pending readers
	Message 1 at [0] of (16+13)
		time: Thu Jan  2 21:46:30 2014
		mlen: 13

Afer this change:

	$ ./jlogctl -d /tmp/vtc.49967.6b8b4567/vtc_jlog_foo    
	/tmp/vtc.49967.6b8b4567/vtc_jlog_foo
		00000000 [29 bytes] 0 pending readers
	Message 1 at [0] of (16+13)
		time: Thu Jan  2 21:46:30 2014
		mlen: 13