Remove inherited configuration options invalid for charm

The charm removes some configuration options only valid for the
subordinate chassis charm.  A side effect of this is that the
deletes section in the OVN layer is replaced by ours, and we then
need to delete configuration options inherited from upstream
layers ourself.

Add missing icon.

Change-Id: I3fd02dee2968ee773ef2b31c18f7c674b12adf43
Closes-Bug: #1879088

src/icon.svg

@@ -0,0 +1,191 @@
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+           cy="482.84048"
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+           id="path3808-4"
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src/layer.yaml

@@ -19,3 +19,10 @@ config:
     - networking-tools-source
     - sriov-device-mappings
     - sriov-numvfs
+    - debug
+    - ssl_ca
+    - ssl_cert
+    - ssl_key
+    - use-internal-endpoints
+    - use-syslog
+    - verbose