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/AlcatelLucent.pm

@@ -1,5 +1,4 @@
 # SNMP::Info::Layer3::AlcatelLucent
-# $Id$
 #
 # Copyright (c) 2008 Bill Fenner
 #
@@ -30,6 +29,7 @@
 package SNMP::Info::Layer3::AlcatelLucent;
 
 use strict;
+use warnings;
 
 use Exporter;
 use SNMP::Info::Layer3;
@@ -115,7 +115,9 @@ sub os_ver {
    my $alu = shift;
 
    my $descr = $alu->description();
-   return $1 if $descr =~ m/\b(\d[\.\d]+R\d+) (?:GA|Service Release), /;
+   if (defined ($descr)) {
+     return $1 if $descr =~ m/\b(\d[\.\d]+R\d+) (?:GA|Service Release), /;
+   }
 
    # No clue what this will try but hey
    return $alu->SUPER::os_ver();
@@ -370,7 +372,7 @@ These are methods that return scalar value from SNMP
 
 =item $alu->vendor()
 
-    Returns 'alcatel-lucent'
+Returns 'alcatel-lucent'
 
 =item $alu->model()