Install zsh completion file

Ayusman Avisek Nandarequested to merge
AyusmanNanda/gradle-completion:fix-zsh-completion into master

gradle-completion: install zsh completion file

Upstream provides the _gradle completion script, but it is not
installed by the Debian package.

Install it into /usr/share/zsh/vendor-completions/ so that
zsh users get proper tab completion.

Closes: #920134

Edited by Ayusman Avisek Nanda

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