junk log messages every time SETCONF changes the set of ORPorts

Every time you use SETCONF (from a controller) to change the set of ORPorts, Tor emits log messages like this:

Sep 30 23:45:59.000 [notice] Opening OR listener on 0.0.0.0:9022
Sep 30 23:45:59.000 [notice] Tor 0.2.4.17-rc-dev (git-00fb525+ace95c5+0e691f1) opening log file.
Sep 30 23:46:00.000 [notice] Your Tor server's identity key fingerprint is 'tbbscraperentry 73EFD4FE8D5D2466ECBDCFAC11894A72A322FD3C'
Sep 30 23:47:42.000 [notice] Opening OR listener on 0.0.0.0:9023
Sep 30 23:47:42.000 [notice] Tor 0.2.4.17-rc-dev (git-00fb525+ace95c5+0e691f1) opening log file.
Sep 30 23:47:42.000 [notice] Your Tor server's identity key fingerprint is 'tbbscraperentry 73EFD4FE8D5D2466ECBDCFAC11894A72A322FD3C'
Sep 30 23:50:40.000 [notice] Closing no-longer-configured OR listener on 0.0.0.0:9008
Sep 30 23:50:40.000 [notice] Tor 0.2.4.17-rc-dev (git-00fb525+ace95c5+0e691f1) opening log file.
Sep 30 23:50:40.000 [notice] Closing old OR listener on 0.0.0.0:9008
Sep 30 23:50:40.000 [notice] Your Tor server's identity key fingerprint is 'tbbscraperentry 73EFD4FE8D5D2466ECBDCFAC11894A72A322FD3C'
Sep 30 23:50:45.000 [notice] Closing no-longer-configured OR listener on 0.0.0.0:9012
Sep 30 23:50:45.000 [notice] Tor 0.2.4.17-rc-dev (git-00fb525+ace95c5+0e691f1) opening log file.
Sep 30 23:50:45.000 [notice] Closing old OR listener on 0.0.0.0:9012
Sep 30 23:50:45.000 [notice] Your Tor server's identity key fingerprint is 'tbbscraperentry 73EFD4FE8D5D2466ECBDCFAC11894A72A322FD3C'

The "opening log file" and "Your Tor server's identity key fingerprint is" lines should not be printed for every configuration change. And I'm not sure why it tells me it's closing a listener twice.

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