Hopefully eliminate race in exports_setup when waiting for mountd to finish.
Changed mountd to write the current timestamp into /var/run/mountd.ts whenever it has finished processing all exports files. So someone who HUPs/USR1s mountd can check and see when the timestamp changes. We use this in exports_setup.proxy to ensure we do not return before mountd has completed parsing and effecting changes. Since I am too lazy to check the before and after values of the timestamp, I just remove that file just before signalling, and then wait for it to reappear to signify that mountd is done.
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