pid1: don't reset setting from /proc/cmdline upon restart

We have settings which may be set on the kernel command line, and also
in /proc/cmdline (for pid1). The settings in /proc/cmdline have higher priority
of course. When a reload was done, we'd reload just the configuration file,
losing the overrides.

So read /proc/cmdline again during reload.

Also, when initially reading the configuration file when program starts,
don't treat any errors as fatal. The configuration done in there doesn't
seem important enough to refuse boot.