rpm package has missing dependencies

[lfarkas]

the rpm package has a missing dependencies. it's try to add user with useradd but do not depend on it. which is not a problem in most case but in case of a kickstart install this cause a problem since it happened that shadow-utils(which contains useradd) installed after this package.

so the spec file should have to modified and add these lines:
Requires(post): /usr/sbin/useradd

[lfarkas]

the same bug was fixed in the latest influxdb : influxdata/influxdb#8951