white space and flake8 cleanup
white space and flake8 cleanup

except for long lines (E501)

Signed-off-by: Ralph Schmieder <071b77189b4aabd52c4e38afde4f209b0660b0e2@cisco.com>

ios-xr/iosxrv-x64-vbox,ios-xr/iosxrv-x64-vbox,ios-xr/iosxrv-x64-vbox