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/EtherLike.pm

@@ -1,5 +1,4 @@
 # SNMP::Info::EtherLike
-# $Id$
 #
 # Copyright (c) 2008 Max Baker changes from version 0.8 and beyond.
 #
@@ -33,6 +32,7 @@
 package SNMP::Info::EtherLike;
 
 use strict;
+use warnings;
 use Exporter;
 use SNMP::Info;
 
@@ -68,7 +68,7 @@ $VERSION = '3.68';
     'el_xmit_defer'      => 'dot3StatsDeferredTransmissions',
 
     # Ethernet-like Collision Statistics Group
-    'el_coll_freq'  => 'dot3CollFrequencies'
+    'el_coll_freq'  => 'dot3CollFrequencies',
 );
 
 %MUNGE = ( %SNMP::Info::MUNGE, 'el_duplex' => \&munge_el_duplex, );
@@ -103,7 +103,7 @@ Max Baker
                              Version     => 2
                            );
 
- my $class = $cdp->class();
+ my $class = $el->class();
  print " Using device sub class : $class\n";
 
  # Find the duplex setting for a port on a device that implements
@@ -143,8 +143,6 @@ None.
 
 =back
 
-MIBs can be found at ftp://ftp.cisco.com/pub/mibs/v2/v2.tar.gz
-
 =head1 GLOBALS
 
 These are methods that return scalar values from SNMP