Commits on Jul 21, 2018

1. Reduce the readiness checks for functions …

   * Significantly improves scale up time for functions (when going
     from 0 -> 1)
   * Health check is hit more frequently, but should not noticibly
     impact performance
   * Use the httpget probe type and leverage the watchdog /healthz
     endpoint
   * Make all probe attributes configurable in charts
   
   This could be optimized a little further if new image for doing
   the http probes where created which would block on connection errors
   and return immediately when the response comes back, but the best
   case is < 1s improvement.
   
   Some performance numbers.  Before (there was a timeout error):
   
   cold start: 10.240251064300537
   error calling function: Command 'echo -n "Test" | faas-cli -g http://192.168.64.78:31112 invoke hello-python' returned non-zero exit status 1.
   cold start: 4.621361255645752
   cold start: 5.6364970207214355
   cold start: 11.648431777954102
   cold start: 8.450724840164185
   cold start: 9.854270935058594
   cold start: 12.048357009887695
   cold start: 12.24026870727539
   
   After:
   
   cold start: 1.8590199947357178
   cold start: 1.8544681072235107
   cold start: 2.065181016921997
   cold start: 1.8414137363433838
   cold start: 1.6598482131958008
   cold start: 2.4577977657318115
   cold start: 2.4510068893432617
   cold start: 2.244048833847046
   cold start: 2.6444039344787598
   
   Signed-off-by: Berndt Jung <bjung@vmware.com>

   

   berndtj committed Jul 21, 2018
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