documentation overhaul (#353)

* ident
* remove $Id$ tags from rcs software which has been retired
* make an effort to sync required mib docs with actual code
* sync even more docs with what code actually does
* some whitespace nits
* fixup example to use snmpv2 for all but the most ancient devices
* remove blurb to find more specific snmp::info classes for classes
  which alrdy are as specific as they can get (eg snmp::info::layer3::vmware
  doesn't need info on to find a specific module since there ain't none)
* rename all sub {vendor} strings to lowercase vendor, if cisco, juniper
  and arista can be lowercase, so can be all the rest.
* fix tests
* spread some use warnings around
* use $ instead of @
* remove defines that are included via parent classes
* use strict + warnings
* remove alrdy included modules
* add comma after last list item
* typos
* mibs are found in our mib repo, not on the cisco site
* documentation fixes

lib/SNMP/Info/Layer3/IBMGbTor.pm

@@ -1,5 +1,4 @@
 # SNMP::Info::Layer3::IBMGbTor - SNMP Interface to IBM Rackswitch devices
-# $Id$
 #
 # Copyright (c) 2013 Eric Miller
 # All rights reserved.
@@ -31,9 +30,9 @@
 package SNMP::Info::Layer3::IBMGbTor;
 
 use strict;
+use warnings;
 use Exporter;
 use SNMP::Info::Layer3;
-use SNMP::Info::LLDP;
 
 @SNMP::Info::Layer3::IBMGbTor::ISA
     = qw/SNMP::Info::LLDP SNMP::Info::Layer3 Exporter/;
@@ -255,7 +254,7 @@ Eric Miller
                           Debug       => 1,
                           DestHost    => 'myswitch',
                           Community   => 'public',
-                          Version     => 1
+                          Version     => 2
                         )
     or die "Can't connect to DestHost.\n";
 
@@ -269,11 +268,6 @@ Abstraction subclass for IBM Rackswitch (formerly Blade Network Technologies)
 network devices. Lenovo acquired these from IBM and is now selling
 them under the Lenovo brand.
 
-For speed or debugging purposes you can call the subclass directly, but not
-after determining a more specific class using the method above.
-
- my $ibm = new SNMP::Info::Layer3::IBMGbTor(...);
-
 =head2 Inherited Classes
 
 =over