Upgrade jsch lib to jsch-0.1.51 to avoid problems running on java7

We had an application sitting on top of Hadoop and got problems using jsch once we switched to java 7. Got this exception:

 com.jcraft.jsch.JSchException: verify: false
	at com.jcraft.jsch.Session.connect(Session.java:330)
	at com.jcraft.jsch.Session.connect(Session.java:183)

Upgrading to jsch-0.1.51 from jsch-0.1.49 fixed the issue for us, but then it got in conflict with hadoop's jsch version (we fixed this for us by jarjar'ing our jsch version).

So i think jsch got introduce by namenode HA (HDFS-1623). So you guys should check if the ssh part is properly working for java7 or preventively upgrade the jsch lib to jsch-0.1.51!

Some references to problems reported:

• http://sourceforge.net/p/jsch/mailman/jsch-users/thread/loom.20131009T211650-749@post.gmane.org/
• https://issues.apache.org/bugzilla/show_bug.cgi?id=53437