Bug#820359: init-system-helpers: Handle \ escape in systemd unit names

[Dan Nicholson]

Package: init-system-helpers
Version: 1.29

Systemd unit names can have valid \ escape characters. See
systemd-escape(1) for examples. When a unit references a another unit
with escaped characters, init-system-helpers handles them incorrectly.
For example, a unit file having WantedBy=foo\x2dbar.target will have
an /etc/systemd/system/foox2dbar.target.wants directory created
without the x escaped by \.

The attached patch fixes this.

--
Dan Nicholson  |  +1.206.437.0833  |  Endless
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