-Override init with our own in order to preserve control of PID 1 (for switch_root)
-Change nbroot shell to actually call shell and loop, rather than exit since that would be init trying to exit now
-Increase destiny retrieval interval a bit to be less harsh, don't background as this must continue to be PID 1
git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@363 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
