SSL: Remove SSLv3 from SSL default due to POODLE attack

- Remove SSLv3 from SSL default in darwinssl, schannel, cyassl, nss,
openssl effectively making the default TLS 1.x. axTLS is not affected
since it supports only TLS, and gnutls is not affected since it already
defaults to TLS 1.x.

- Update CURLOPT_SSLVERSION doc

docs/libcurl/opts/CURLOPT_SSLVERSION.3

@@ -35,7 +35,7 @@ Use one of the available defines for this purpose. The available options are:
 .RS
 .IP CURL_SSLVERSION_DEFAULT
 The default action. This will attempt to figure out the remote SSL protocol
-version, i.e. either SSLv3 or TLSv1
+version.
 .IP CURL_SSLVERSION_TLSv1
 TLSv1.x
 .IP CURL_SSLVERSION_SSLv2
@@ -69,6 +69,8 @@ if(curl) {
 .SH AVAILABILITY
 SSLv2 is disabled by default since 7.18.1. Other SSL versions availability may
 vary depending on which backend libcurl has been built to use.
+
+SSLv3 is disabled by default since 7.39.0.
 .SH RETURN VALUE
 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
 .SH "SEE ALSO"