Description of problem:
When building from source and using systemd, the file glusterd.service has a hardcoded path instead of using the value specified with '--prefix' to './configure'.

Version-Release number of selected component (if applicable):
master

How reproducible:
Always

Steps to Reproduce:
git clone
./configure --prefix=/path/foo
make 
make install

Actual results:
glusterd.service looks for glusterd inb a hardcoded path

Expected results:
glusterd.service honors the --prefix value.