Added detection for SEH USB DeviceServers (librenms#16718)

* SEH: Initial detection with USB port detection

* To Plan SVG

* Add snmprec

* Fix snmprec and created test json

* Rename OS from seh to seh-uds (USB DeviceServer)

* Refresh test data

* add mib_dir

Author: mpikzink

html/images/logos/seh.svg

@@ -0,0 +1,30 @@
+mib: SEH-PSRV-MIB
+modules:
+    os:
+        sysDescr_regex: '/SEH (?<hardware>\S+); SN (?<serial>\S+), .* SW (?<version>\S+)/'
+    sensors:
+       state:
+           data:
+               -
+                   oid: utnPortTable
+                   value: utnPortSlot
+                   num_oid: '.1.3.6.1.4.1.1229.2.50.2.1.27.{{ $index }}'
+                   descr: 'Port{{ utnPortIndex }}: {{ utnPortUsbOwn }}'
+                   group: USB Port
+                   index: 'utnPortIndex.{{ $index }}'
+                   skip_values:
+                   -
+                      oid: utnPortTag
+                      op: 'exists'
+                      value: false
+                   state_name: utnPortSlot
+                   states:
+                       - { value:  0, generic: 3, graph: 0, descr: disabled }
+                       - { value:  1, generic: 0, graph: 0, descr: enabled }
+                       - { value:  2, generic: 0, graph: 0, descr: enabled }
+                       - { value:  3, generic: 0, graph: 0, descr: enabled }
+                       - { value:  4, generic: 0, graph: 0, descr: enabled }
+                       - { value:  5, generic: 0, graph: 0, descr: enabled }
+                       - { value:  6, generic: 0, graph: 0, descr: enabled }
+                       - { value:  7, generic: 0, graph: 0, descr: enabled }
+                       - { value:  8, generic: 0, graph: 0, descr: enabled }

html/images/os/seh.svg

@@ -0,0 +1,8 @@
+os: seh-uds
+text: 'SEH'
+type: appliance
+icon: seh
+mib_dir: seh
+discovery:
+    - sysObjectID:
+        - .1.3.6.1.4.1.1229