rpmPackageInstallation/6.0: remove spaces

rpmPackageInstallation/6.0: speed up the promise by using a method to call an update bundle

rpmPackageInstallation/6.0: Passing rpm_index to call_update bundle to fix classes declaration

rpmPackageInstallation/6.0: jooooooon's right noshell gives another ~2/3s boost

rpmPackageInstallation/6.0: Actually using noshell makes the command fail with the following error: CRITICAL:yum.cli:Command line error: option -d: invalid integer value: ':'

rpmPackageInstallation/6.0: Fix ifvarclass on usebundle