Refactor configuration of SSL to allow override with custom config (docker-java#596)

* Refactor configuration of SSL to allow override with custom config

* Store SSLConfig instead SSLContext

* avoid NPE

* prepare release

* Coding style changes

Author: marcuslinke

pom.xml

@@ -10,7 +10,7 @@
 	<groupId>com.github.docker-java</groupId>
 	<artifactId>docker-java</artifactId>
 	<packaging>jar</packaging>
-	<version>3.0.1-SNAPSHOT</version>
+	<version>3.0.0-kostyasha-3</version>
 
 	<name>docker-java</name>
 	<url>https://github.com/docker-java/docker-java</url>

src/main/java/com/github/dockerjava/api/command/DockerCmdExecFactory.java

@@ -3,8 +3,6 @@
 import java.io.Closeable;
 import java.io.IOException;
 
-import javax.net.ssl.SSLContext;
-
 import com.github.dockerjava.core.DockerClientConfig;
 import com.github.dockerjava.core.RemoteApiVersion;
 
@@ -117,8 +115,6 @@ public interface DockerCmdExecFactory extends Closeable {
 
     DisconnectFromNetworkCmd.Exec createDisconnectFromNetworkCmdExec();
 
-    DockerCmdExecFactory withSSLContext(SSLContext sslContext);
-
     @Override
     void close() throws IOException;