Change configtls to parse a tls.Config to allow re-using in http connections

[bogdandrutu]

Backwards compatible change for the configuration.

[codecov]

Codecov Report

Merging #1184 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1184      +/-   ##
==========================================
+ Coverage   87.48%   87.50%   +0.01%     
==========================================
  Files         202      202              
  Lines       14530    14531       +1     
==========================================
+ Hits        12712    12715       +3     
+ Misses       1377     1376       -1     
+ Partials      441      440       -1     

Impacted Files	Coverage Δ
config/configgrpc/configgrpc.go	100.00% <100.00%> (ø)
config/configtls/configtls.go	100.00% <100.00%> (ø)
receiver/jaegerreceiver/factory.go	91.52% <100.00%> (ø)
receiver/opencensusreceiver/config.go	94.44% <100.00%> (ø)
receiver/otlpreceiver/config.go	94.44% <100.00%> (ø)
translator/internaldata/resource_to_oc.go	76.47% <0.00%> (+2.94%)	⬆️

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