Reduce site dependence by adding new attr vars.
uid/gid users gratia,tomcat,glexec,condor,hdfs,mapred,squid,cvmfs are set in attr.
new attr sets and defaults
 OSG_CE_Export_LocalDir value="/scratch"
 OSG_CE_Mount_ShareDir value="/sharesoft/osg"
 OSG_CE_DataDir value="/data/se/osg"
 OSG_WN_TmpDir value="/tmp"