tests: mark manifestfulltextcache as conditional on revlog store
This file is currently specific to the revlog store. Other stores
may not implement it. Mark it as such in test output.
Differential Revision: https://phab.mercurial-scm.org/D4395
.. Common link and substitution definitions.
.. |hg(1)| replace:: **hg**\ (1)
.. _hg(1): hg.1.html
.. |hgrc(5)| replace:: **hgrc**\ (5)
.. _hgrc(5): hgrc.5.html
.. |hgignore(5)| replace:: **hgignore**\ (5)
.. _hgignore(5): hgignore.5.html