#910 implement import of snmpwalk and more robust snapshot handling (#1086)

* initial work

* initial work

* initial work

* some fixes for time and Layer3 weird spec

* store again the snapshot after update for specific

* resolve the enums

* monkeypatch SNMP::translateObj to avoid hardware exception on macOS

* only save cache to db in the late phase worker

* no need to check for cache on transport, can just go ahead and try

* use database only for oidmap instead of netdisco-mibs

* rewrite device snapshot to gather loaded mib leafs only

* remove old walker code from snapshot worker

* allow snmp browser to work without snapshot

* only store snapshot leafs which the device responded on

* refactor to separate snapshot work from snmp transport work

* refactor to separate snapshot work from snmp transport work

* allow typeahead on MIB qualified leafs

* fixes for snmpwalk input after previous refactor

* add the extra stuff SNMP::Info device class uses into snapshot

* better width for snmp search box

* fix css for snmp options

* add spinner while snmp loading

* add spinner while snmp loading

* add spinner while snmp loading

* support SNMP::Info device class or named MIBs as extra on snapshot

* add final tidy and bug fix

lib/App/Netdisco/Util/Device.pm

@@ -166,9 +166,8 @@ sub is_discoverable {
   $remote_type ||= '';
   $remote_cap  ||= [];
 
-  my $pseudo_cache = catfile( catdir(($ENV{NETDISCO_HOME} || $ENV{HOME}), 'logs', 'snapshots'), $device->ip );
   return _bail_msg("is_discoverable: $device is pseudo-device without offline cache")
-    if $device->is_pseudo and ! -f $pseudo_cache;
+    if $device->is_pseudo and not $device->oids->count;
 
   return _bail_msg("is_discoverable: $device matches wap_platforms but discover_waps is not enabled")
     if ((not setting('discover_waps')) and