About switch Tomcat to Jetty

[Ma, Junjie]

Hi all,
         Currently, the Sqoop2 works with tomcat and it's not easy to do the 
package, test and so on.
         I'll start to switch the web server from Tomcat to Jetty, and the 
umbrella JIRA is SQOOP-910.
         This is a huge change, feel free for any comments, thanks for your 
help.

Best regards,

Colin Ma(Ma Jun Jie)