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Make xdock-java depend on jaeger-agent (#97)

The xdock-java container exists immediately with the error:

Exception in thread "main" java.lang.RuntimeException: TUDPTransport cannot connect:
	at com.uber.jaeger.reporters.protocols.ThriftUdpTransport.newThriftUdpClient(ThriftUdpTransport.java:49)
	at com.uber.jaeger.senders.UdpSender.<init>(UdpSender.java:46)
	at com.uber.jaeger.crossdock.JerseyServer.senderFromEnv(JerseyServer.java:165)
	at com.uber.jaeger.crossdock.JerseyServer.main(JerseyServer.java:142)
Caused by: java.net.SocketException: Unresolved address
	at java.net.DatagramSocket.connect(DatagramSocket.java:493)
	at com.uber.jaeger.reporters.protocols.ThriftUdpTransport.newThriftUdpClient(ThriftUdpTransport.java:47)
	... 3 more

It actually wants to connect to jaeger-client, according to strace:

[pid 28925] sendto(8, "\2\0\0\0\16\0\0\0\r\0\0\0jaeger-agent\0", 25, MSG_NOSIGNAL, NULL, 0) = 25

This patch tries to make jaeger-agent spawn before xdock-java

Signed-off-by: Nehal J Wani <nehaljw.kkd1@gmail.com>

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