install_server.sh: Removed relative paths, enabled backslash escapes on Redhat.

This patch removes the relative paths, making it possible to run the install_server.sh script from every location without first have to step into the utils folder.
I've also enabled backslash escapes for the echo statement used to write the init.d scripts on systems that have 'chkconfig' (e.g. Redhat).
Without this the init.d script failed.

The other changes are the remove of unnecessary whitespaces.

Tested on Redhat and Ubuntu.