Improve fake $HOME test isolation code
The commit "Fake $HOME to isolate tests from user" started setting $HOME in the CTest script environment. On some platforms tests depend on some local configuration in the home directory, such as the "cvs login" for KWSys in CTestTest3. In this commit we now construct a fake home dir during CMake config step and populate it with a .cvspass file needed by the test. We also check CTEST_NO_TEST_HOME to optionally disable the test home. See issue #9949.
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