SM-2324: Use JcaPooledConnectionFactory instead of XaPooledConnectionFactory

Thanks to Benjamin Graf for the patch!!!

(Cherry picked from the commit 9881d7b29c444bb92e3455e12c6b0caed0174b6a)
[SM-2320] Upgrade to Karaf 2.3.6-SNAPSHOT
[SM-2337]fix incorrect sonatype maven repo url
Fix broken build: Add Apache snapshots plugin repository

(cherry picked from commit 50e411f4eb02872ed767337f72db32b3718522da)
SM-2255: Enforce English locale in Stats report

(cherry picked from commit eebcef05a6ce4544e1c5abb0e8681cfd6cf4ee01)
Prepare for release: Update RELEASE-NOTES
[SM-2320] Prepare for release - revert "Upgrade to Karaf 2.3.6-SNAPSHOT"

This reverts commit 10ee82c29bbf3aee0a970c6e1b481f02f76006f0.
[maven-release-plugin] prepare release servicemix-5.1.1
[maven-release-plugin] prepare for next development iteration
[SM-2320] Upgrade to Karaf 2.3.6-SNAPSHOT