Correct syntax error in install_server.sh

Shell ! operator requires a space.  In the current script, all defaults are accepted automatically because the "if" statements silently error.


RedHat Enterprise 6.4
```
sh-4.1$ which chkconfig
/sbin/chkconfig
```

example: 
```
sh-4.1$  if [ !`which chkconfig` ]; then echo "won't get here"; fi
sh: !`which: event not found
```

corrected: 
```
sh-4.1$  if [ ! `which chkconfig` ]; then echo "not found"; else echo "found"; fi
found
```