Regression from bug 517773, which was not completely implemented.

rsyslog needs to check if it can read from /proc/kmsg as non-root, and
not drop privileges if not. In other works, seteuid(), read() -> on
fail, seteuid(0) and keep it that way, on success -> setuid() ->
permanently drop privs.


** Summary changed:

- 20100218 EC2 image (ami-0512fe6c): Cannot read proc file system: 1 - 
Operation not permitted.
+ rsyslogd spins CPU on older kernels

-- 
rsyslogd spins CPU on older kernels
https://bugs.launchpad.net/bugs/523610
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