travis: fix buffer overflow in Java_java_net_Inet4AddressImpl_getLocalHostName of OpenJDK6 and OpenJDK7 when using precise distribution
travis: fix buffer overflow in Java_java_net_Inet4AddressImpl_getLocalHostName of OpenJDK6 and OpenJDK7 when using precise distribution

To fix this use the current (trusty) distribution and manually install openjdk-6-jdk and a java 6 compatible maven version.



git-svn-id: 89dde08772e8bf23e1f06e036eef0c1fe886f791@1811489 13f79535-47bb-0310-9956-ffa450edef68

apache/commons-email,apache/commons-email,apache/commons-email