Update MANIFEST.MF examples in WS-Trust/STS docs

There was an already closed similar jira JBEAP-3191, I created this new one because examples changed a bit since then.

There are several examples of MANIFEST.MF files in Development guide for web services taken from upstream documentation.

My proposal is to keep them as simple as possible:

• remove Created-By line or at least update it with some version of supported Java 8+ (Created-By: 1.8.0_73 (Oracle Corporation))
• remove Ant-Version

one of current examples:

Manifest-Version:1.0
Ant-Version: Apache Ant1.8.2
Created-By:1.7.0_25-b15 (Oracle Corporation)
Dependencies: org.jboss.ws.cxf.jbossws-cxf-client,org.jboss.ws.cxf.sts

sufficient MANIFEST file:

Manifest-Version: 1.0
Dependencies: org.jboss.ws.cxf.jbossws-cxf-client, org.jboss.ws.cxf.sts

And also, if I understand correctly the specification, there must be a SPACE after colon attribute-name: value, some of the examples don't have them.
reference https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html