Drop the runtime lock while calling syslog() in case it blocks for a long time.
Drop the runtime lock while calling syslog() in case it blocks for a long time.

The effect of writing synchronously to /var/log/messages has become much more noticable ever since we moved to a kernel with a fixed fsync().

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@eu.citrix.com>

xapi-project/message-switch,xapi-project/message-switch,johnelse/forkexecd,xapi-project/message-switch,djs55/forkexecd