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Chrome creates the container with default username derived from
the email address of the current logged in profile.
E.g. test.user@gmail.com gets username 'testuser'.

It is possible for users to change the username inside the container.
As long as the user keeps uid=1000, this does not cause issues
except for the sshfs mount where FilesApp connects to the container
using 'sshfs://username@hostname'.

Cicerone is now updated to return the container username in
ContainerStartedSignal and in SetUpLxdContainerUser.  CrostiniManager
can now use this for the sshfs mount.

Removed crostini_util ContainerHomeDirectoryForProfile which was
using the default username.  The container homedir is now available
in CrostiniManager::GetContainerInfo.

Bug: 916297
Change-Id: I27f41647c3b8809170521d741867a8ed430e5476
Reviewed-on: https://chromium-review.googlesource.com/c/1388124
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619897}