Change 19768

@tom_tyler @russell_jackson
Bug fix for running p4master_run as root, and some comment header cleanup. Job 000543

p4master_run: Preserve original arguments list and use this when exec'ing as $OSUSER. Add text about sourcing p4_vars yourself instead of using p4master_run. Run p4login directly without p4master_run since p4login calls p4_vars now.

everything else: Remove comment block about needing to run with p4master_run. Reword comment
  about SDP_INSTANCE since it is not always an integer value.
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