update to use TLSv1.2

[seanlaval]

cloudant will not allow TLS 1 connections any more

[chrisinmtown]

Forgive me for asking a non-TLS question on this PR, but is the Ektorp project still active? Last commit seems to be Nov 2017; most recent PR before this was opened late 2018.

[YannRobert]

Hi @seanlaval could you please explain why you think this is necessary?

TLS 1.2 is enabled by default in Oracle JDK 8 since b122 (March 2014)
So you should have TLS 1.2 enabled already.

[YannRobert]

@chrisinmtown The project is not in active development, meaning no big change is expected to be merged, but PR on existing features may be merged when necessary. It turns out that most PR are not strictly necessary. Also you can extend or replace most of the component by your own for specific needs.

[seanlaval]

@YannRobert it seems that the problem we saw might be due to using IBM java which has different default behaviour to Oracle java wrt Default SSL Context .. see https://www.ibm.com/support/knowledgecenter/en/SSYKE2_8.0.0/com.ibm.java.security.component.80.doc/security-component/jsse2Docs/matchsslcontext_tls.html