17 clean up services structure (#18)

* Refactor ClipService and MediaService

* Refactor ClipService for less coupling to Jobs

* PATCH unnecessary requests in frontend

* REFACTOR MetadataService to use CommandRunner

* REFACTOR DirectoryService and UploadService

* REFACTOR ClipService

* MERGE MetadataService with MediaService

src/main/java/com/ddf/vodsystem/dto/CommandOutput.java

@@ -0,0 +1,16 @@
+package com.ddf.vodsystem.dto;
+
+import lombok.Data;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Data
+public class CommandOutput {
+    private List<String> output = new ArrayList<>();
+    private int exitCode;
+
+    public void addLine(String line) {
+        output.add(line);
+    }
+}