Description of problem:

Looking through the Beaker documentation I was not able to find
any mention about the REBOOTCOUNT variable which is quite useful
for tasks which require the system to be rebooted to detect
whether the reboot already happened.

This is implemented in rhts-test-runner.sh:
http://git.fedorahosted.org/git/?p=rhts.git;a=blob;f=bin/rhts-test-runner.sh;hb=HEAD

138 if [ ! -e "/var/cache/rhts/$TESTID/reboot" ]; then
139     mkdir -p /var/cache/rhts/$TESTID
140     export REBOOTCOUNT=0
141     echo 1 > /var/cache/rhts/$TESTID/reboot
142 else
143     export REBOOTCOUNT=$(cat /var/cache/rhts/$TESTID/reboot)
144     echo $(expr $REBOOTCOUNT + 1) > /var/cache/rhts/$TESTID/reboot
145 fi

Please, document this in the Beaker Deployment Guide. Thanks.