Added cni logging methods.

[Nurdin Premji <npremji at redhat dot com>]

I've added some methods to frysk/sys/cni/Errno.hxx called:

logMessage (jobject myThis, Logger logger, Level level, char* msg, ...)

this will print a log message to the given logger where msg, ... is a 
printf style message, so you can check values of ints and pointers and such.

jLogMessage (jobject myThis, Logger logger, Level level, char * msg, ...)

this will print a log message to the given logger where msg should be a 
string of the form:
"functionName Object value: {1} Object2 value: {2} ..." followed by 
jobjects for each value.

Note that both methods should be called with the first argument as 
"this" and prepend a "{0} " to the front of the string so that the 
object gets printed out.