[patch] more SELinux initialization cleanup

[Colin Walters]

Hi,

The previous patch fixed one issue, but introduced another.  Right now,
the bus converts context->sid during the config file parsing which maps
service->context.  But since the avc isn't initialized yet, it can't
convert context->sid.  This didn't show up in my previous testing
because my test machine wasn't labeling any services.  

The bootstrapping problem here is tricky.  The solution I took was to
simply not convert context->sid during config file parsing; instead, we
simply store service->context string mappings, and then later convert
context->sid after everything's initialized.  This required breaking the
config file parsing into separate steps.

I also fixed a bit of code which assumed that avc_context_to_sid could
only return ENOMEM; it actually can also return EINVAL too.

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