Remove/fix rest-assured library

This library depends on jaxb 2.2, but RESTEasy uses JAXB 2.3. We can't rely on tests with checks from this library.

• testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/validation/ValidationJaxbTest.java:[46,32] package io.restassured.path.json ...
• testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/validation/ValidationXMLTest.java:[13,32] package io.restassured.path.json ...

[INFO] +- org.jboss.resteasy:resteasy-core-spi:jar:4.0.0-SNAPSHOT:provided
[INFO] |  +- org.jboss.spec.javax.xml.bind:jboss-jaxb-api_2.3_spec:jar:1.0.1.Final:compile
...
[INFO] \- io.rest-assured:rest-assured:jar:3.3.0:test
[INFO]    \- io.rest-assured:xml-path:jar:3.3.0:test
[INFO]       +- javax.xml.bind:jaxb-api:jar:2.2.12:test
[INFO]       +- com.sun.xml.bind:jaxb-osgi:jar:2.2.10:test
[INFO]       \- org.apache.sling:org.apache.sling.javax.activation:jar:0.1.0:test

This library is targeted to JDK 1.6

This library was added by rhn-engineering-ema and rhn-support-asoldano, see this commit

This library adds 5.4 MB of new dependencies (quite a lot for one library).