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test-filecache: use sys.executable to call python

Description

test-filecache: use sys.executable to call python

As was mentioned in c102b704edb5, test scripts calling 'python' or 'python3'
might use the wrong python.
For test-filecache.py, this causes a failed test on CentOS 7.

Differential Revision: https://phab.mercurial-scm.org/D9295

Details