Feature to gather SNMP Walk, use as Pseudo Device, and Browse Objects

* fix anomalous name

* add gather worker

* fix encoding of binary storage

* store results back to job

* now parsing mbis report to translate

* fix the broken report parser

* rename gather to snapshot

* implement walk code copied from SNMP::Info

* can now bulkwalk and parse mibs report and store resolved walk in cache

* add func/glob aliasing broken

* better aliasing

* implement aliasing from globals and funcs

* fix regexp for matching netdisco-mibs report

* fake cache entry for all ND2 methods called, add comments

* also save to logs/snapshots/IP

* add doc for netdisco-do

* add is_pseudo column to device table

* support for loading cache for pseudo devices

* check for hrSystemUptime as well as sysUpTime for snmp connect

* display pseudo devices with yellow pill for name

* color all cells for layers for pseudo

* no need to b64 encode binary data in scalars as we b64 whole thing after

* tweaked uptime check

* store snapshot to database instead of Job

* expose snapshots in device details tab

* small ux improvements on snap download

* fixes for errors in subnet mask searching

* hide snapshot management for pseudo devices

* update to use new netdisco-mibs object cache

* update for new format oids file

* start of work on loading walk into db for browsing

* store values and meta

* add auto increment col and oid index to browser

* start web plugin for browser

* add virtual search for oid children

* have all oid in separte table (60 seconds load on my laptop)

* rename table and add relation

* store oid as int array

* fix sql for children

* make jstree start working

* working very slow tree expand

* fix to work when first displaying tree

* store both oid and oid_parts

* simplify SQL to speed up (more complicated perl)

* fix sql bug, add better index, prettify tree

* render the snmp node detail

* add node template, make scrollable, pretty print data values (insecure)

* store munge hint

* some dubious code to munge the data

* make sure to filter by IP on device_browser

* make safer the rendering of value data (but need to come back to key ordering)

* fix sorting on object values

* limit the opening of child nodes to keep response good and unclutter

* factor out the munge and make safer

* reject unknown mungers

* show the munger and option (not working) to change

* additional js for munge select

* complete custom munge

* change so that saving to database is only at CLI and on request

* hide snmp tab if no browser rows in the db

* add helpful message when no browser rows for the device

* stub handler for search and add recurse control

* working search

* minor ui fixes

* implement typeahead for leaf search

* limit rows in typeahead

* make sure device_browser is visited in delete and renumber

* add requirements for this branch

* update manifest

* make sure node search and typeahead are restricted to current device only

bin/netdisco-do

@@ -422,6 +422,24 @@ Pass a device in C<-d> to display them:
 
  ~/bin/netdisco-do dumpconfig -d 192.0.2.1 -e device_auth
 
+=head2 snapshot
+
+Performs an snmp walk from L<.1.3.6.1> on the device and builds a data
+structure which SNMP::Info can use to mimic the device.  The structure is
+saved into the L<device_snapshot> database table.
+
+Pass a value to the L<-p> parameter (mnemonic: persist) and the base64 encoded
+data will also be saved to L<NETDISCO_HOME/logs/snapshots/IP> (where L<IP> is
+the canonical IP of the device passed). Netdisco will load this for any pseudo
+device with the same canonical IP.
+
+ ~/bin/netdisco-do snapshot -d 192.0.2.1 -p yes
+
+Pass a value to the L<-e> parameter (mnemonic: explore> and the data is also
+saved into the Netdisco database for web browsing (under Device->SNMP tab).
+
+ ~/bin/netdisco-do snapshot -d 192.0.2.1 -e yes
+
 =head1 DEBUG OPTIONS
 
 The flag "C<-R>" will cause any changes to the database to be rolled back