Fix return (exit) codes returned by meza.py (#890)
Fix return (exit) codes returned by meza.py (#890)

* sys.exit doesn't seem to respect return codes other than int 0 and 1 (and maybe 2)
* Make all meza.py return codes use meza_shell_exec_exit(rc)

freephile/qb,enterprisemediawiki/meza,freephile/qb,freephile/meza,enterprisemediawiki/meza,enterprisemediawiki/meza,freephile/meza,enterprisemediawiki/Meza1,freephile/meza,freephile/qb,enterprisemediawiki/meza,freephile/meza,enterprisemediawiki/Meza1,enterprisemediawiki/Meza1