Two VCP::Source::p4 problems

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It turns out rev->action is free-form, and can be 'integrate' when
coming from p4 source.  However source::p4::get_source_file only
allows fetching 'add' or 'edit' revs.

Also source::p4::get_source_file will be very unhappy about deleted
files, as perforce considers the deleted files the same as
non-existing files on client, so there will be an unexpected message.
The function is also unhappy about file not present after running p4
sync -f.  But when would source::p4::get_source_file get such file?
When there's a base_revified 'delete' revs.  The other Dest drivers
don't seem to handle such case either.

Cheers,
CLK

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