[Hawkular-dev] Getting rid of agent/server password in clear

[John Mazzitelli]

> As other secrets on the standalone.xml (like data source passwords) ,
> the password should be stored in the vault.

+1

> Vaults should be used for this. The good thing is that, AFAIK, no change
> on the agent is required. The subsystem sees the actual clear text value
> from the vault.

+1