Some improvements

Thank you for plugin!
I allowed myself to make some improvements.

Diff below

1 – Adding option for crypto protocol in snmpv3

75a76,81
> parser.add_option(“-a”,”–snmp_protocol”, dest=”snmp_protocol”,
> help=”SNMP protocol (only with SNMP v3)”, default=None)
> parser.add_option(“-X”,”–snmp_passphrase”, dest=”snmp_passphrase”,
> help=”SNMP passphrase (only with SNMP v3)”, default=None)
> parser.add_option(“-x”,”–snmp_privproto”, dest=”snmp_privproto”,
> help=”SNMP privproto (only with SNMP v3)”, default=None)
107c113
snmp_options = snmp_options + ” -u %s -l %s -A %s -a %s -X %s -x %s ” % (opts.snmp_username,opts.snmp_seclevel,opts.snmp_password,opts.snmp_protocol,opts.snmp_passphrase,opts.snmp_privproto)

2 – Option exclude now may be a list( -e [2,3,4]) usefull for powermodules check

234c240
if myIndex in opts.exclude: continue