From: Tomáš Ďurovec <tomas.durovec@pantheon.tech>

The OSSession (and its subclasses) should accept PurePaths
for remote paths to translate from OS-unaware (PurePath)
to OS-aware (Path) only on the remote side. For local paths,
they should accept Paths, as Python is OS-aware locally.

Signed-off-by: Tomáš Ďurovec <tomas.durovec@pantheon.tech>
Signed-off-by: Luca Vizzarro <luca.vizzarro@arm.com>