windows compatibility

[Benjamin Jaton]

May I suggest to change this:

src/java/main/org/apache/zookeeper/server/quorum/QuorumPeerConfig.java

 out.write("dynamicConfigFile="
*  .concat(dynamicFile.getCanonicalPath())*
  .concat("\n"));

to this:

*.concat(PathUtils.normalizeFileSystemPath(dynamicFile.getCanonicalPath()))*

I believe otherwise the ZK can't restart on WIndows.

I can open a JIRA if needed.

Thanks
Ben