Use DTLS_method for openssl >= 1.0.2

[AndyLc]

Issue #, if available:

Description of changes: DTLSv2 is available for openssl >= 1.0.2, so use DTLSv2 when available.

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[codecov-commenter]

Codecov Report

Merging #1360 (ae9a8e4) into master (4127014) will decrease coverage by 28.18%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1360       +/-   ##
===========================================
- Coverage   85.83%   57.64%   -28.19%     
===========================================
  Files          42       42               
  Lines       10600    10600               
===========================================
- Hits         9098     6110     -2988     
- Misses       1502     4490     +2988     

Impacted Files	Coverage Δ
src/source/Crypto/Dtls_openssl.c	94.55% <ø> (ø)
src/source/Crypto/Tls.c	0.00% <0.00%> (-100.00%)	:arrow_down:
src/source/Ice/TurnConnection.c	0.00% <0.00%> (-93.34%)	:arrow_down:
src/source/Signaling/ChannelInfo.c	0.00% <0.00%> (-88.03%)	:arrow_down:
src/source/Crypto/Tls_openssl.c	0.00% <0.00%> (-84.30%)	:arrow_down:
src/source/Signaling/Signaling.c	11.32% <0.00%> (-83.78%)	:arrow_down:
src/source/Signaling/LwsApiCalls.c	1.33% <0.00%> (-82.74%)	:arrow_down:
src/source/Signaling/StateMachine.c	0.00% <0.00%> (-81.45%)	:arrow_down:
src/source/Ice/SocketConnection.c	50.90% <0.00%> (-28.83%)	:arrow_down:
src/source/Signaling/FileCache.c	73.87% <0.00%> (-23.43%)	:arrow_down:
... and 10 more

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