kes Add additional messages when Job canceled automatically for

kes  Add additional messages when Job canceled automatically for
     max run time or max start wait exceeded.  This fixes bug #621.
kes  Update maxruntime-test in regression script to properly test
     max run time -- from info given in bug #621.
kes  Simplify automatic cancel code.
kes  Add check for job_canceled() in FD when contacting SD so that if
     job is canceled from max runtime, it terminates faster.

git-svn-id: https://bacula.svn.sourceforge.net/svnroot/bacula/trunk@3809 91ce42f0-d328-0410-95d8-f526ca767f89