Making it easier for cygwin users to run OpenDaylight using run.sh.

With this change, the users will only have to add the following line
to their .bashrc to make it run: export CLASSPATH=".;lib/*;"

Change-Id: Icc1576ea1c46568d43f11d90eebecb06c74db184
Signed-off-by: Srini Seetharaman <srini.seetharaman@gmail.com>