Document SSH configuration

doc/management.md

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+# SSH Management
+
+The default SSH hostkey is generated on first boot and is used in both
+SSH and NETCONF (SSH transport). Custom keys can be added to the
+configuration in `ietf-keystore`. The ony suuported hostkey type is
+RSA for now, so the private must be `ietf-crypto-types:rsa-private-key-format` and the public key
+`ietf-crypto-types:ssh-public-key-format`
+
+## Use your own SSH hostkeys
+
+Hostkeys can be generated with OpenSSL:
+```bash
+openssl genpkey -quiet -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -outform PEM > mykey
+openssl rsa -RSAPublicKey_out < mykey > mykey.pyb
+```
+Store the keys in `ietf-keystore` _without_ the header and footer information
+created by OpenSSL.
+
+After the key has been stored in the keystore and given the name
+_mykey_ it can be added to SSH configuration:
+
+	admin@example:/> configure
+	admin@example:/config/> edit ssh
+	admin@example:/config/ssh/> set hostkey mykey