Explicitly set ECDHE curve
Explicitly set ECDHE curve

Some vintages of the SSL stack require we explicitly request a curve,
so here it is.

jjohnson42/confluent,whowutwut/confluent,jjohnson42/confluent,jjohnson42/confluent,whowutwut/confluent,whowutwut/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,xcat2/confluent,whowutwut/confluent,jjohnson42/confluent,xcat2/confluent,xcat2/confluent