Packages: fixed building for Ubuntu 16.04 "xenial".

Changes introduced in a27532e3a17b effectively broke building of the unit
package due to missed dh_installsystemd script in older debhelper 9.x.

Packages: fixed building for Ubuntu 16.04 "xenial".

Changes introduced in a27532e3a17b effectively broke building of the unit
package due to missed dh_installsystemd script in older debhelper 9.x.

Once Ubuntu 16.04 reach EOL, the following actions should be made:
- this commit should be reverted;
- minimal debhelper version should be increased to 11.

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