Add the lastModificationTimeMs into Inode

Add the lastModificationTimeMs into Inode. Update the Inode, InodeFile, InodeFolder.
In order to see the modification time on WebUI, update the WebUI.
The Inode's lastModificationTimeMs will be set whenever the Inode's metadata changes.
About the 'modifying "JournalTest.java" to test lastModificationTimeMs' stuff, actually, it needs to compare ClientFileInfo inside, there it will compare the lastModificationTimeMs.