OpenSshPublicKey is stored in session/view, needs to be serializable

Helps with AttributeQueries and ECP Logins

Should make debugging and answering of user requests easier.

Can be retrieved by %X{ipAddr} in Logging pattern.

No really fixed, not just hidden...

For now closes #77. 

Resolve "Change Samba LDAP group attributes"

Closes #75

See merge request simon/reg-app!11

Resolve "Add Timeout for AttributeQueries"

Closes #76

See merge request simon/reg-app!10

Can be overridden by global config metadata_timeout in ms

Resolve "Let User deploy their SSH Public Keys"

Closes #72

See merge request simon/reg-app!9

Resolve "Replace Cluster Singleton"

Closes #71

See merge request simon/reg-app!8

Remove singleton scheduler classes for JBoss/Wildfly specific API.