weblogic-certificate plugin

Initial version of the weblogic-certificate plugin

Introduces 2 new Containers:
- CustomTrustKeyStore
- CustomIdentityKeyStore

and 2 Deployables
- TrustCertificateSpec
- IdentityCertificateSpec

and an SSL Channel restart contributor
Keystores are in that sense "part of" the server configuration (separate tab with a dropdown for the mode, depending on the mode some configuration properties). So how would you model having to choose one of the keystore modes and subsequently handling mandatory properties per mode?

Of course if we are to proceed on this, we would also have to indicate somehow that we don't support each mode.