RFR: Backport for JDK-8207237 to JDK 11

[Jamil Nimeh]

Hi folks,

This is a review for a backport to the JDK 11 repo of a change I did 
earlier to jdk/jdk that fixed the SSLSocket.setEnabledCipherSuites 
method.  It no longer accepts empty strings in the cipher suite list.  
Instread, it returns to the behavior of throwing 
IllegalArgumentException as it did before the new TLS handshaker code 
was committed.

Webrev: http://cr.openjdk.java.net/~jnimeh/reviews/8207237-jdk11/webrev.01/

JBS: https://bugs.openjdk.java.net/browse/JDK-8207237

Thanks,

--Jamil