Replace Bootstrap Grid CSS with PatternFly grid in kubevirt, nmstate and networking. 

In OpenShift 4.20, we plan to remove the Bootstrap Grid CSS from console (jira: CONSOLE-4550). Please check your dynamic plugins to see if you're using these classes, and replace them with PatternFly grid as needed. Here are some notes from when I did this transition in console: * I did a global search with the regex col-[a-z][a-z] to search for the presence of bootstrap columns in the console repo for migration

• You will likely want the hasGutter prop in your <Grid> element to emulate the column gutters in the BS CSS.
• The .clearfix class was removed and no longer does anything
• By default GridItem spans 12 columns, so col-xs-12 is no longer necessary
• Replace col-[a-z][a-z](pull|push)[0-9][0-9]? with the order prop in the PF GridItem compoennt
• Replace col-[a-z][a-z]offset[0-9][0-9]? with the offset, smOffset, ..., xl2Offset in the PF GridItem component
• In some cases, the usage of Grid would not be best practice (for example, the Form component would be better suited for form layouts)

PS: Please also take a look at the other CSS in the ancillary folder, and remove usage of any of these ancillary classes or styles as well (e.g., the (visible|hidden)-(xs|sm|md|lg) classes, which can be replaced by the PF Display utility classes).We want to aim for a pure PatternFly implementation of console, so these styles will also likely be removed in the future