Verify that metadata can be sync'd to a frag that has missed a POST
and consequently that frag appears to be expired, when in fact the
POST removed the X-Delete-At header.
Tests the fix added by the Related-Change.
Related-Bug: #1683689
Related-Change: I919994ead2b20dbb6c5671c208823e8b7f513715
Co-Authored-By: Clay Gerrard <clay.gerrard@gmail.com>
Change-Id: I9af9fc26098893db4043cc9a8d05d772772d4259