try to work around travis failure with openjdk6
try to work around travis failure with openjdk6

======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x37)[0x7fb74d75edb7]
/lib/x86_64-linux-gnu/libc.so.6(+0x10bcb0)[0x7fb74d75dcb0]
/usr/lib/jvm/java-6-openjdk-amd64/jre/lib/amd64/libnet.so(Java_java_net_Inet4AddressImpl_getLocalHostName+0x1a0)

uwolfer/gerrit-rest-java-client,uwolfer/gerrit-rest-java-client