* test/openssl/test_pair.rb: Modify TestSSL#test_read_and_write
  to handle partial sysreads. [Bug #7398][ruby-core:49563]
* test/openssl/test_ssl.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46164 b2dd03c8-39d4-4d8f-98ff-823fe69b080e