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/BlueCoatSG.pm

@@ -28,6 +28,7 @@ package SNMP::Info::Layer3::BlueCoatSG;
 # POSSIBILITY OF SUCH DAMAGE.
 
 use strict;
+use warnings;
 use Exporter;
 use SNMP::Info::Layer3;
 
@@ -55,7 +56,7 @@ $VERSION = '3.68';
 %MUNGE = ( %SNMP::Info::Layer2::MUNGE, %SNMP::Info::Layer3::MUNGE, );
 
 sub vendor {
-    return 'Blue Coat';
+    return 'bluecoat';
 }
 
 sub os {
@@ -65,7 +66,7 @@ sub os {
 sub os_ver {
     my $sg = shift;
     my $os_string = $sg->sw_ver();
-    if ($os_string =~ /^Version:\s(\w+)\s([\d\.]+)/) {
+    if (defined ($os_string) && $os_string =~ /^Version:\s(\w+)\s([\d\.]+)/) {
         return $2;
     } else {
         return ''; # perhaps we can try sysDescr or some other object...
@@ -92,7 +93,7 @@ Jeroen van Ingen
                           Debug       => 1,
                           DestHost    => 'myrouter',
                           Community   => 'public',
-                          Version     => 1
+                          Version     => 2
                         )
     or die "Can't connect to DestHost.\n";
 
@@ -113,10 +114,10 @@ Subclass for Blue Coat SG Series proxy devices
 
 =head2 Required MIBs
 
- BLUECOAT-SG-PROXY-MIB
-
 =over
 
+=item F<BLUECOAT-SG-PROXY-MIB>
+
 =item Inherited Classes' MIBs
 
 See L<SNMP::Info::Layer3/"Required MIBs"> for its own MIB requirements.
@@ -133,7 +134,7 @@ These are methods that return scalar value from SNMP
 
 =item $router->vendor()
 
-Returns C<'Blue Coat'>
+Returns C<'bluecoat'>
 
 =item $router->os()