Restrict runtime event log permissions#602
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This PR tightens filesystem permissions for the runtime event log so that it is only readable/writable by the owner (root).
This addresses part of the concern raised in #557 about other processes inside the CVM being able to tamper with the runtime event log. The CVM is not designed as a multi-tenant environment; untrusted workloads should be sandboxed by the application itself. However, making the log file private to the owning process is a straightforward hardening step with no downside.