[WFCORE-253] Enable the use of expressions for sasl-protocol and server-name.
[WFCORE-256] Remove comment saying Kerberos is only for HTTP.
[WFCORE-257] Remove TODO comment to add access constraints as these attributes are already contained within resources flagged as being MANAGEMENT_INTERFACES.
Merge pull request #335 from darranl/WFCORE-257

[WFCORE-257] Remove TODO comment to add access constraints
Merge pull request #333 from darranl/WFCORE-256

[WFCORE-256] Remove comment saying Kerberos is only for HTTP.
Merge pull request #332 from darranl/WFCORE-253

[WFCORE-253] Enable the use of expressions for sasl-protocol and server-name