Added .service to hooks unit files

[aleerizw-zz]

Recent versions of systemd (version 229 at least) included in Ubuntu
16.04 and Debian 9 require the systemd unit files to have a .service
extension.

Fixes #3919

Signed-off-by: Ali Rizwan ari@hellofresh.com

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[aleerizw-zz]

/assign @zmerlynn

[chrislovecnm]

Which operating systems have you tested? We have all the major ones. This is awesome, we may want to get it into 1.8

[chrislovecnm]

/ok-to-test

[chrislovecnm]

Question about testing, which OS types have you tried

[justinsb]

/lgtm

Thanks @aleerizw ... my only fear is that people might have been specifying this on the name already, so I might send you back a PR to check that :-)

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/test all [submit-queue is verifying that this PR is safe to merge]

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Automatic merge from submit-queue.