allow jenkins to have more open more files

hosts/jenkins/etc/default/jenkins

@@ -37,7 +37,7 @@ JENKINS_LOG=/var/log/jenkins/$NAME.log
 #   this is on by default because http://github.com/jenkinsci/jenkins/commit/2fb288474e980d0e7ff9c4a3b768874835a3e92e
 #   reported that Ubuntu's PAM configuration doesn't include pam_limits.so, and as a result the # of file
 #   descriptors are forced to 1024 regardless of /etc/security/limits.conf
-MAXOPENFILES=8192
+MAXOPENFILES=32768
 
 # set the umask to control permission bits of files that Jenkins creates.
 #   027 makes files read-only for group and inaccessible for others. comment this out to inherit setting