Fix install_server.sh for CentOS/RHEL

The check to see if chkconfig exists is missing a space after `!`, so on CentOS/RHEL, the script will still try to use update-rc.d:

    Installing service...
    ./install_server.sh: line 178: update-rc.d: command not found


This patch changes two occurrences (lines 162 and 176) of :

    if [ !`which chkconfig` ] ; then 

to

    if [ ! `which chkconfig` ] ; then