Telegraf throws Illegal Instruction on arm A9 system

[russorat]

Relevant telegraf.conf:

N/A

System info:

arm A9 system
telegraf 1.7.2

Steps to reproduce:

1. try to install and run telegraf_1.7.2-1_armel.deb on an arm A9 system
2. notice the illegal instruction when trying to run telegraf

Expected behavior:

telegraf runs

Actual behavior:

illegal instruction thrown when starting

Additional info:

basically, you need to try to get to setting GOARM=5 in the build script but the logic is incorrect. If you try to build with --arch=armel, then on line https://github.com/influxdata/telegraf/blob/master/scripts/build.py#L455 the arch is overwritten to be arm and then the logic on line https://github.com/influxdata/telegraf/blob/master/scripts/build.py#L461 is never executed.

[osingla]

The issue is that the armel.deb image currently built using build.py with this command:
./scripts/build.py --platform=linux --arch=armel --version 1.7.2 --package
generate actually an armhf image (GOARM=6) instead of the expected armel (GOARM=5), and this image will require a cpu with floating point and a kernel built with armhf support.