DONT MERGE: Expose the ability to disable encryption.

[igorbernstein2]

This is necessary to allow client developers to test against emulators.
Unfortunately this flag is marked as @Experimental in grpc. @garrettjonesgoogle, can you check with grpc folks if the experimental flag can be lifted?

[codecov-io]

Codecov Report

Merging #458 into master will decrease coverage by 0.09%.
The diff coverage is 16.66%.

@@             Coverage Diff             @@
##             master     #458     +/-   ##
===========================================
- Coverage     71.01%   70.92%   -0.1%     
  Complexity      743      743             
===========================================
  Files           156      156             
  Lines          3340     3346      +6     
  Branches        240      241      +1     
===========================================
+ Hits           2372     2373      +1     
- Misses          875      880      +5     
  Partials         93       93

Impacted Files	Coverage Δ	Complexity Δ
...api/gax/grpc/InstantiatingGrpcChannelProvider.java	39.02% <16.66%> (-1.15%)	8 <0> (ø)

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[garrettjonesgoogle]

I will make a request offline. Their tracking issue for removing this instance of @ExperimentalApi is grpc/grpc-java#1772 .

[igorbernstein2]

It seems like this feature will be GA in grpc 1.12

[sduskis]

@igorbernstein2, this is an old PR. Can we close it?

[igorbernstein2]

Yes, I worked around it using a fixed channel provider