common: New function log_debug_with_string.
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Description

common: New function log_debug_with_string.

* common/logging.c (do_logv): Factor some code out to ...
(print_prefix): new.
(log_logv): Add arg EXTRASTRING and print it.  Change all callers to
pass NULL for it.
(log_debug_with_string): New.  Uses EXTRASTRING.

This function can be used to print a human readable buffer in addition
to a log message to the log stream. This function will keep all lines
together and prefix them with ">> ".