For issue #3952, merge r1143997,r1144499 from the revprop-packing branch.
For issue #3952, merge r1143997,r1144499 from the revprop-packing branch.

This makes FSFS complain when opening or accessing a format-5 (f5) filesystem,
created only by 1.7-dev builds and never released.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion