diffmanifests: Handle Missing Projects in Repo Workspace

By default there are 4 categories in the diffmanifests
api puts the diffs in to - added, removed, changed and unreachable

Example of command - repo diffmanifests 1.xml 2.xml

added - list down the projects present in second manifest but not in
first
removed - list down the projects present in first but not in
second
changed - list down the changes and the differences for each project
unreachable - when it encounters revision value in a project is incorrect

But, when there are projects present in both manifests and could not
find in local workspace where we have cloned the repo(because of
different/subset manifest xml) - this will create unhandled exception

Now we have added a 5th category called 'missing' - where in such
cases it will handle the scenario and print the log for user

Example:
added projects :
        project_2 at revision e6c8a59832c05dc4b6a68cee6bc0feb832181725

removed projects :
        project_1 at revision e6c8a59832c05dc4b6a68cee6bc0feb832181725

changed projects :
        project_3 changed from 3bb890e1286f04e84d505e5db48e0ada89892331 to e434b3736f11537c67590fefadfe4495895e9785

missing projects :
        project_4

Change-Id: I244e8389bff7e95664c29d3dcb61e22308e3a573
Signed-off-by: Shashank Devaraj <shashankkarthik@gmail.com>
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/344774
Reviewed-by: Mike Frysinger <vapier@google.com>

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