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Perform sshfs mount to termina/penguin immediately when container
starts.  Mounting code has moved from the chrome.fileManagerPrivate
extension functions into CrostiniManager.

This change will make FilesApp more responsive to users who are
likely to use terminal or some other crostini app before using FilesApp.

Bug: 846917
Change-Id: I9fc246e45e54390e7a75f15a5571a24218cf2d5c
Reviewed-on: https://chromium-review.googlesource.com/1158317Reviewed-by: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580094}