#587 #561 update pseudo devices to better support ssh arpnip

this patch resets all pseudo devices to have no layer3 support but adds a
feature to the pseudo devices admin panel to enable layer3 support. it also
changes arpnip and arpwalk behaviour to always permit the action if layer3
is available (ignoring the vendor).

documentation will need updating to tell users to create pseudo devices
with layer3 support when they want to arpnip an unsupported platform.

arpnip with ssh/cli against a supported platform (one that can be discovered)
will continue to work normally.

Squashed commit of the following:

commit 9dad5be81d
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Tue Sep 3 09:03:53 2019 +0100

    allow pseudo with layer 3 to run arpnip

commit 7d97943fcd
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Tue Sep 3 08:59:10 2019 +0100

    allow pseudo devices with layer 2/3 capability

commit d1fdf574e3
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Tue Sep 3 08:55:41 2019 +0100

    move pseudo and layer checks to is_able from is_able_now

commit e0f72ef67d
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Tue Sep 3 08:51:42 2019 +0100

    ports defaults to one

commit 86ba01270c
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Tue Sep 3 08:50:45 2019 +0100

    add tooltip for arpnip toggle

commit cdd2470228
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Tue Sep 3 08:34:46 2019 +0100

    simplify template

commit 46236d68ea
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Sep 1 23:53:56 2019 +0100

    a fix up for pseudo devices which need layer 3

commit 016d249efc
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Sep 1 20:37:11 2019 +0100

    do not wrap buttons

commit 1ec1402e0c
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Sep 1 20:33:03 2019 +0100

    implement user settable layer-three service for pseudo devices

commit a267efa3d8
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Sep 1 18:39:22 2019 +0100

    only set layer if successful action

commit b108be5e23
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Sep 1 18:32:19 2019 +0100

    should defer SNMP against pseudo devices

commit 897ba3a629
Merge: e0ddbaab a7348900
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Sep 1 14:54:36 2019 +0100

    Merge branch 'master' into og-pseudo-vs-cli-arpnip

commit e0ddbaab08
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Mon Aug 26 11:35:13 2019 +0100

    as last commit, for discover

commit 61f9c89040
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 25 23:55:38 2019 +0100

    move pseudo and layer checks into is_*able functions

commit 8b010d4023
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 25 18:38:11 2019 +0100

    any device completing macsuck/arpnip must have that layer

commit a11bce7863
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 25 18:33:27 2019 +0100

    clean up device layers

commit d2661bff61
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 25 18:18:02 2019 +0100

    first make arpnip behave like other jobs towards pseudo devices

share/schema_versions/App-Netdisco-DB-58-59-PostgreSQL.sql

@@ -2,4 +2,10 @@ BEGIN;
 
 ALTER TABLE users ADD COLUMN "radius" boolean DEFAULT false;
 
+UPDATE device SET layers = NULL WHERE vendor = 'netdisco';
+
+UPDATE device SET layers = '00000000' WHERE layers IS NULL;
+
+ALTER TABLE device ALTER layers SET DEFAULT '00000000';
+
 COMMIT;