enable typha and add horizontal autoscaler

[jackfrancis]

What this PR does / why we need it: enables Typha for Calico and also adds a horizontal autoscaler for it

Copied from Azure/acs-engine#4290

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

If applicable:

• documentation
• unit tests
• tested backward compatibility (ie. deploy with previous version, upgrade with this branch)

Release note:

enable typha and add horizontal autoscaler

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis

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[jackfrancis]

Manual tests check out.

[codecov]

Codecov Report

Merging #68 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
+ Coverage   52.42%   52.44%   +0.01%     
==========================================
  Files          91       91              
  Lines       12804    12801       -3     
==========================================
  Hits         6713     6713              
+ Misses       5483     5480       -3     
  Partials      608      608