This update for salt fixes the following issues:

- Remove virt.pool_delete fast parameter (U#54474)
- Remove unnecessary yield causing BadYieldError (bsc#1154620)
- Prevent 'Already reading' continuous exception message (bsc#1137642)
- Fix for aptpkg test with older mock modules
- Remove wrong tests for core grain and improve debug logging
- Use rich RPM deps to get a compatible version of tornado into the buildroot.
- Accumulated changes from Yomi:
core.py: ignore wrong product_name files
zypperpkg: understand product type
- Enable usage of downloadonly parameter for apt module
- Fix StreamClosedError issue (bsc#1157479)
- Let salt-ssh use platform-python on RHEL8 (bsc#1158441)

This update was imported from the SUSE:SLE-15-SP1:Update update project.