Improve arm packaging

I've had some trouble with making use of the packages in [repos.influxdata.com](https://repos.influxdata.com).

For CentOS they are packaged for the `armhf` architecture, however the [armhfp release of CentOS](https://wiki.centos.org/SpecialInterestGroup/AltArch/armhfp) actually expects packages to be `armv7hl`. I am by no means an expert on arm architectures, but as far as I can tell, these refer to the same thing. Indeed I have been running your `armhf` build on my `armv7hl` CentOS install on a Raspberry Pi 3b+ for quite some time without issue.

The problem is that `yum` cannot install "different" architectures, so I have to `wget` and install with `rpm` directly, making the repo somewhat pointless.

I have recently switched up to Fedora 29 and arm64 on the RPi, but run into the same problem - the packages on repos.influxdata.com are all packaged for `arm64`, whereas the arm64 release of Fedora (and indeed the [arm64 CentOS](https://wiki.centos.org/SpecialInterestGroup/AltArch/AArch64) too) both expect `aarch64` packages. Again these are the same thing as far as I know, and the package runs fine when installed manually, but the difference makes the the package manager and the repo not usable.