Remove unused imports

Author: Josh Ghiloni

headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java

@@ -22,7 +22,6 @@
 import org.springframework.ide.vscode.commons.util.PartialCollection;
 import org.springframework.ide.vscode.commons.util.Renderable;
 import org.springframework.ide.vscode.commons.util.Renderables;
-import org.springframework.ide.vscode.commons.util.StringUtil;
 import org.springframework.ide.vscode.commons.util.ValueParseException;
 import org.springframework.ide.vscode.commons.util.ValueParser;
 import org.springframework.ide.vscode.commons.util.ValueParsers;
@@ -37,7 +36,6 @@
 import org.springframework.ide.vscode.commons.yaml.reconcile.TypeBasedYamlHierarchicalSymbolHandler.HierarchicalDefType;
 import org.springframework.ide.vscode.commons.yaml.schema.BasicYValueHint;
 import org.springframework.ide.vscode.commons.yaml.schema.DynamicSchemaContext;
-import org.springframework.ide.vscode.commons.yaml.schema.SchemaContextAware;
 import org.springframework.ide.vscode.commons.yaml.schema.YType;
 import org.springframework.ide.vscode.commons.yaml.schema.YTypeFactory;
 import org.springframework.ide.vscode.commons.yaml.schema.YTypeFactory.AbstractType;
@@ -59,9 +57,7 @@
 import org.yaml.snakeyaml.nodes.MappingNode;
 import org.yaml.snakeyaml.nodes.Node;
 
-import com.fasterxml.jackson.databind.jsonschema.SchemaAware;
 import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableSet;
 
 /**
  * @author Kris De Volder