[PATCH v3 5/6] u_boot_pylib: Use correct coverage tool within venv

[Simon Glass]

When running within a Python venv we must use the 'coverage' tool (which
is within the venv) so that the venv packages are used in preference to
system packages. Otherwise the coverage tests run in a different
environment from the normal tests and may fail due to missing packages.

Handle this by detecting the venv and changing the tool name.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v1)

 tools/u_boot_pylib/test_util.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Applied to u-boot-dm, thanks!