[IM] added command-line options for debugging
[IM] added support for PBRIDGE-MIB with fallback to BRIDGE-MIB
[IM] added support for vlans
[IM] add warning in debug mode if vlan is not specified
[IM] refactor code to abstract some functions and clean things up
[IM] support dot1qVlanFdbId/jnxExVlanTag vlan mapping
panic() if cannot get snmp info for l2database
[BF] Dell F10 S4810 doesn't support dot1qVlanFdbId or any other sort of vlan mapping
Merge branch 'master' into im-update-snmp-mac-gleaning
Merge branch 'im-update-snmp-mac-gleaning'
[IM] Q-BRIDGE-MIB and vlan support added to update-l2database.pl