Bug 13159 - Enhancements to the SIP2 command line emulator

Bug 13159 - Enhancements to the SIP2 command line emulator

I needed to be able to perform checkout operations for testing from the
command line. I ended up reengineering the SIP2 command line tester
quite a bit.

Enhancements:
* Moved message generation code to subroutines
* Added support for more messages
* Added command line switches for each supported message
* Enabled use of Sip::Constants to keep code DRY and more understandable
* Moved script from misc to C4/SIP
* Designed with an eye towards possibly moving some code to CPAN in the future
* Also designed to make adding new messages much easier in the future

Test Plan:
1) Apply this patch
2) Look at help via ./C4/SIP/sip_cli_emulator.pl --help
3) Test patron status request and patron information, should work as before
   except you need to pass the command line switche -m <message_name>
4) Test the new checkout option using -m checkout -i <item barcode>

Signed-off-by: Benjamin Rokseth <benjamin.rokseth@kul.oslo.kommune.no>
Worked as advertised, with one warning at renew only:

Trying 'renew'
Use of uninitialized value $value in concatenation (.) or string at ./sip_cli_emulator.pl line 462, <GEN0> chunk 1.

Signed-off-by: Olli-Antti Kivilahti <olli-antti.kivilahti@jns.fi>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>