Windows: Escaped command line arguments in subprocess.

The command line for the containerizer has the command encoded
as JSON. Non escaped quotes are removed during the containerizer
startup and the JSON processed is invalid.

Review: https://reviews.apache.org/r/47486/

3rdparty/libprocess/include/process/windows/subprocess.hpp

@@ -126,7 +126,13 @@ inline Try<PROCESS_INFORMATION> createChildProcess(
   // to have been already quoted correctly before we generate `command`.
   // Incorrectly-quoted command arguments will probably lead the child process
   // to terminate with an error. See also NOTE on `process::subprocess`.
-  const string command = strings::join(" ", argv);
+  string command = strings::join(" ", argv);
+
+  // Escape the quotes in `command`.
+  //
+  // TODO(dpravat): Add tests cases that cover this functionality. See
+  // MESOS-5418.
+  command = strings::replace(command, "\"", "\\\"");
 
   // NOTE: If Mesos is built against the ANSI version of this function, the
   // environment is limited to 32,767 characters. See[1].