feat(TextInput): Add Focus TextInput example

[boaz0]

I added an example of how to focus on TextInput.

Using innerRef props that was added in this change and React.forwardRef I could get the input component and focus on it.

[coveralls]

Pull Request Test Coverage Report for Build 3410

• 3 of 4 (75.0%) changed or added relevant lines in 1 file are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 82.049%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/patternfly-4/react-core/src/components/TextInput/TextInput.js	3	4	75.0%

Files with Coverage Reduction	New Missed Lines	%
packages/patternfly-4/react-core/src/components/TextInput/TextInput.js	3	75.0%

Totals
Change from base Build 3402:	-0.05%
Covered Lines:	3952
Relevant Lines:	4554

---

💛 - Coveralls

[patternfly-build]

PatternFly-React preview: https://912-pr-patternfly-react-patternfly.surge.sh

[tlabaj]

@boaz1337 Can you please resolve conflicts in your branch.

[jgiardino]

I'm not able to review this. I get a "page not found" error when I try to navigate to the preview.

[boaz0]

@jgiardino yes me too. I guess because tests failed.

I will try to fix this soon as possible.

Thanks.

[tlabaj]

@boaz1337 looks like this one is still failing the build. Could you please take a look at that. Thanks!

[dgutride]

This PR has become stale - it isn't related to any issues we have open. If you'd like to continue forward, please respond before March 18, 2019 and we'll keep it open otherwise we'll close as inactive.

[codecov-io]

Codecov Report

Merging #912 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #912      +/-   ##
==========================================
+ Coverage   83.86%   83.87%   +<.01%     
==========================================
  Files         556      557       +1     
  Lines        5857     5859       +2     
  Branches       12       12              
==========================================
+ Hits         4912     4914       +2     
  Misses        943      943              
  Partials        2        2

Flag	Coverage Δ
#patternfly3	84.89% <ø> (ø)	⬆️
#patternfly4	81.53% <100%> (+0.01%)	⬆️
#patternflymisc	95.65% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
...re/src/components/TextInput/ForwardRefTextInput.js	100% <100%> (ø)
...4/react-core/src/components/TextInput/TextInput.js	91.66% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1f12527...633ad03. Read the comment docs.

[dgutride]

Closing due to no response - please reopen once an issue has been created and accepted for this work to begin.

[boaz0]

@dgutride - I thought you got a notification about rebasing the PR.
is it possible to open this PR again ❓ 🙏