context: Do some syntactic normalization on filesystems

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Paths containing ".." are rejected: they're almost certainly a
terrible idea.

Paths containing "." or multiple slashes are syntactically normalized.

This assumes that nobody is going to use "--filesystem=/foo/bar/" to
mean "make /foo/bar available, unless it's a non-directory, in which
case fail".

Signed-off-by: Simon McVittie <smcv@collabora.com>

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