[PAXEXAM-272] Support Knopflerfish in Native Container regression tests
[PAXEXAM-272] Support Knopflerfish in Native Container regression tests

There are now Maven profiles equinox, felix and knopflerfish for each of
the three frameworks. equinox and felix are active by default.

Activating knopflerfish causes a conflict with Felix, which must be an
app classloader issue.

To test on Knopflerfish, use
mvn -P-felix,knopflerfish clean integration-test
koma-akdb/org.ops4j.pax.exam2,koma-akdb/org.ops4j.pax.exam2,ops4j/org.ops4j.pax.exam2,The-Alchemist/org.ops4j.pax.exam2,ops4j/org.ops4j.pax.exam2,bimargulies/org.ops4j.pax.exam2,The-Alchemist/org.ops4j.pax.exam2,bimargulies/org.ops4j.pax.exam2