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outgoing: pass subrepo path using function argument instead of abssource hack

Authored by marmoute.

Description

outgoing: pass subrepo path using function argument instead of abssource hack

This is clearer, remove the needs for the repo._subtoppath hack and will make
our live easier when making outgoing accept multiple destinations.

Differential Revision: https://phab.mercurial-scm.org/D10390