Fix auto screenshots for session browser with latest pytest
Fix auto screenshots for session browser with latest pytest

_fixture_values and _funcargs properties, the internal API for FixtureRequest
object, are no longer available in latest versions of pytest. It appears
fixturenames property and getfixturevalue() method can be used for the purpose
of retrieving all session_browser fixture instances. According to changelog,
both are available on pytest 3.0.0 and up.

Signed-off-by: Sunil Mohan Adapa <3eaa7035e78e5eca849aa1e8ea4aaf97b4588601@medhas.org>

pytest-dev/pytest-splinter