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/Layer2/HP4000.pm

@@ -32,6 +32,7 @@
 package SNMP::Info::Layer2::HP4000;
 
 use strict;
+use warnings;
 use Exporter;
 use SNMP::Info::Layer3;
 use SNMP::Info::MAU;
@@ -49,7 +50,6 @@ $VERSION = '3.68';
 %MIBS = (
     %SNMP::Info::Layer3::MIBS,
     %SNMP::Info::MAU::MIBS,
-    %SNMP::Info::LLDP::MIBS,
     %SNMP::Info::CDP::MIBS,
     'RFC1271-MIB'    => 'logDescription',
     'HP-ICF-OID'     => 'hpSwitch4000',
@@ -427,7 +427,7 @@ sub set_i_vlan {
                     $hp->error_throw("Error removing previous untagged vlan from port, should never happen...\n") unless defined $rv;
                 }
             } else {
-                # If vlan change was not succesful, try to revert to the old situation.
+                # If vlan change was not successful, try to revert to the old situation.
                 if (defined $old_untagged) {
                     $rv = $hp->set_hp_v_if_tag(2, $old_untagged) if defined $old_untagged;
                     if (defined $rv) {
@@ -504,11 +504,6 @@ Note:  Some HP Switches will connect via SNMP version 1, but a lot of config
 data will not be available.  Make sure you try and connect with Version 2
 first, and then fail back to version 1.
 
-For speed or debugging purposes you can call the subclass directly, but not
-after determining a more specific class using the method above.
-
- my $hp = new SNMP::Info::Layer2::HP4000(...);
-
 =head2 Inherited Classes
 
 =over