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
SM-2255: Enforce English locale in Stats report
Prepare for release: Update RELEASE-NOTES
[SM-2320] Prepare for release - revert "Upgrade to Karaf 2.3.6-SNAPSHOT"

This reverts commit ef9bc2ec669b2df51113c60feec536cbea486a92.
[maven-release-plugin] prepare release servicemix-5.0.3
[maven-release-plugin] prepare for next development iteration
[SM-2320] Upgrade to Karaf 2.3.6-SNAPSHOT