Remove possibly unneeded JAXB, activation dependencies added post-Java 8

[scottkurz]

Just noticed we have dependencies in integration tests like:

<!-- because JDK9? -->
<dependency>
   	<groupId>javax.xml.bind</groupId>
	<artifactId>jaxb-api</artifactId>
	<version>2.3.0</version>
</dependency>
<dependency>
	<groupId>com.sun.activation</groupId>
	<artifactId>javax.activation</artifactId>
	<version>1.2.0</version>
</dependency>

Not sure if we're adding this for any reason or because we copied from another project that needed this as APIs were removed from the JDK in later Java releases.

Not sure if this is purely an IT issue or somehow applies to other things.

We might just start by grepping and removing them from the whole project and seeing what breaks.