QPID-4733: Fix cmake installation of init scripts

- Install both qpidd and qpidd-primary init scripts.
- Fix path substitution to use absolute paths.
- Fix substitution to work on cmake and automake.
- Set executable permissions for init scripts.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1466645 13f79535-47bb-0310-9956-ffa450edef68