run.sh/.bat should not complaint when running with a JRE

Since jboss-web 2.x (tc6) a full JDK with toos.jar is not required anymore for compiling jsp pages, since jboss web packages the eclipse jdt compiler and javassist has its own internal compiler.

Modify the run.bat/.sh script to not complain if %JAVA_HOME%\lib\tools.jar is missing, but neverthless, put it in the classpath if exists, in case the user wants to override the default eclipse jdt compiler in the jboss web configuration.