1. Properly clean pid files in the case of the error. 2. Write the supervisor pid before the restart loop, so we don't    uselessly rewrite it after every child restart. 3. Remove duplicate ppfh and pfh initialization.
1. Properly clean pid files in the case of the error.
2. Write the supervisor pid before the restart loop, so we don't
   uselessly rewrite it after every child restart.
3. Remove duplicate ppfh and pfh initialization.

Approved by:	re (glebius)
MFC after:	2 weeks

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