ViewProvider show replaces viewContainer provided by ObjectView

[shefalijoshi]

As of Vue 2.x:

The provided element merely serves as a mounting point. Unlike in Vue 1.x, the mounted element will be replaced with Vue-generated DOM in all cases. It is therefore not recommended to mount the root instance to or .

https://vuejs.org/v2/api/#el

This means the viewContainer we are passing to the show methods of our viewProviders are being replaced by the view's contents.
The css classes 'c-object-view' and 'u-contents' applied to the viewContainer are no longer available to us.
See: https://github.com/nasa/openmct/blob/master/src/ui/components/ObjectView.vue#L92

@charlesh88 Unsure what those classes were meant to do - please advise.

Note: This likely isn't breaking openMCT is any serious way yet.