Without this change, any failed assertion in the second (or a later) test
inside a test suite has a chance of double deleting memory, resulting in
a heap corruption. See #1096 for details.
This leaves alone the test cases where we "just" use cl_git_sandbox_init()
and cl_git_sandbox_cleanup(). These methods already take good care to not
double delete a repository.
Fixes#1096
The reset hard tests had hardcoded expected file content and was
not correctly compensating for CRLF filtering when a file needed
to be reverted by the reset hard. This fixes that.
The `git_reset` API with the HARD option is still slightly
broken, but this test now does exercise the ability of the
command to revert modified files.
