[dvcs tests] Fix log messages; add another cd() variant

Log messages weren't converted when the Executor class was converted
from Groovy to Java.

platform/dvcs/testFramework/com/intellij/dvcs/test/Executor.java

@@ -21,6 +21,7 @@ import com.intellij.openapi.util.SystemInfo;
 import com.intellij.openapi.util.io.FileUtil;
 import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.openapi.vfs.CharsetToolkit;
+import com.intellij.openapi.vfs.VirtualFile;
 
 import java.io.File;
 import java.io.IOException;
@@ -53,6 +54,10 @@ public class Executor {
     }
   }
 
+  public static void cd(VirtualFile dir) {
+    cd(dir.getPath());
+  }
+
   public static String pwd() {
     return ourCurrentDir;
   }
@@ -157,15 +162,15 @@ public class Executor {
       for (String dir : path.split(File.pathSeparator)) {
         File file = new File(dir, name);
         if (file.canExecute()) {
-          log("Using $programName from PATH");
+          log("Using " + programName + " from PATH");
           return file.getPath();
         }
       }
     }
 
-    throw new IllegalStateException("$programName executable not found. " +
-                                    "Please define a valid environment variable ${pathEnvs.iterator().next()} " +
-                                    "pointing to the $programName executable.");
+    throw new IllegalStateException(programName + " executable not found. " +
+                                    "Please define a valid environment variable " + pathEnvs.iterator().next() +
+                                    " pointing to the " + programName + " executable.");
   }
 
   protected static void log(String msg) {