Update-regression fixes (bnc#783967,(bnc#734672):

- imklog: added $klogParseKernelTimestamp option (default off),
wich reverts to the 5.8.x behavior to use receive time for the
kernel messages instead to try parse and convert the kernel
timestamp, what is not reliable on some hardware (bnc#783967).
- imklog: added $klogKeepKernelTimestamp option (default off),
causing to not remove the kernel timestamp from the message
after a successful conversion (bnc#783967).
- imklog: fixed a conversion bug causing a <1sec incorrectness
of the message time (bnc#783967).
- imuxsock: do not log EAGAIN in nonblocking recvfrom (bnc#734672)

Added bugzilla and upstream commit url references for the patches