Added -A option to 'closesessions' CLI to require administrative permissions upon execution.

usage: closesessions
-A,--adminuser <arg> Admin username
-c,--context <arg> A valid context identifier
-h,--help Prints a help text
-l,--login <arg> The optional JMX login (if JMX authentication is
enabled)
-P,--adminpass <arg> Admin password
-p,--port <arg> The optional JMX port (default:9999)
-s,--password <arg> The optional JMX password (if JMX authentication
is enabled)