PF4 - use context api in page component

[jschuler]

Closes: #2188

[patternfly-build]

PatternFly-React preview: https://2208-pr-patternfly-react-patternfly.surge.sh

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@14d1d70). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #2208   +/-   ##
=========================================
  Coverage          ?   80.27%           
=========================================
  Files             ?      658           
  Lines             ?     8252           
  Branches          ?      643           
=========================================
  Hits              ?     6624           
  Misses            ?     1326           
  Partials          ?      302

Flag	Coverage Δ
#patternfly3	85.23% <ø> (?)
#patternfly4	75.82% <100%> (?)

Impacted Files	Coverage Δ
...atternfly-4/react-core/src/components/Page/Page.js	56% <100%> (ø)
...fly-4/react-core/src/components/Page/PageHeader.js	90% <100%> (ø)
...ly-4/react-core/src/components/Page/PageSidebar.js	100% <100%> (ø)

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[tlabaj]

We have . context Selector. Why are we hiding this?

[jschuler]

This has been here since before the context selector got created. Perhaps we should update the page component now to support it? Should be in a separate PR though. @rachael-phillips

[tlabaj]

agreed. We should do tis in a separate PR. @rachael-phillips I opened a separate issue (#2285) to track that work.

[redallen]

Fix merge conflicts and I'll reapprove!

[patternfly-build]

PatternFly-React preview: https://patternfly-react-pr-2208.surge.sh

[tlabaj]

LGTM

[dlabaj]

LGTM