Updated the log4j.properties file data to direct log files under mule home.

Signed-off-by: Kalyan <kalyan.menda@whiteskylabs.com>
Used StringEscapeUtils to avoid the conversion of < to &lt; and > to &gt;

Signed-off-by: Kalyan <kalyan.menda@whiteskylabs.com>
Merge branch 'master' of git@github.com:kalyanwsl/wsl-usecases.git into mule-instrumentation-system
Merge pull request #41 from kalyanwsl/mule-instrumentation-system

Mule instrumentation system