When logging with timestamps, append only until newline

When we log time timestamps, don't print a new timestamp for each
input - instead, print one at the start of every line, and then
wait until we hit a newline to print a new timestamp.

This still doesn't exactly mirror the Docker behavior (they don't
print until they receive an entire line, while we print any time
the logs file is appended to - so you can see partial lines being
typed in our system). Also, timestamps are recorded as the start
of a line being typed, as opposed to when the enter key is
pressed (on Docker).

(Worth noting that, while characters are printed as they are
typed, logs does respect the backspace key - so you'll also see
them disappear as the person typing realizes they've made a
mistake and retypes their command).

This is the closest we can get to Docker without major surgery on
the Kubernetes log-printing library, so I'm content to call this
an adequate solution.

Signed-off-by: Matthew Heon <mheon@redhat.com>

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