Empty mails do not get a received header attached when using smtpserver, patch contributed by Mark (JAMES-1547)

git-svn-id: https://svn.apache.org/repos/asf/james/server/trunk@1591185 13f79535-47bb-0310-9956-ffa450edef68
karaf integration tests randomly failing due to external repository availability/connectivity, patch contributed by Mark (JAMES-1546)

git-svn-id: https://svn.apache.org/repos/asf/james/server/trunk@1592312 13f79535-47bb-0310-9956-ffa450edef68
Disable JamesAppSpringMainTest#testServer (JAMES-1555)

git-svn-id: https://svn.apache.org/repos/asf/james/server/trunk@1615628 13f79535-47bb-0310-9956-ffa450edef68