Use curl instead of wget
Use curl instead of wget

Fixes issue with installer failing to build with the following:

```
wget: error getting response: Connection reset by peer
The command '/bin/sh -c wget
https://github.com/andyshinn/alpine-pkg-glibc/releases/download/2.22-r5/glibc-2.22-r5.apk
&& apk --allow-untrusted add glibc-2.22-r5.apk && rm glibc-2.22-r5.apk
&& rm -rf /var/cache/apk/*' returned a non-zero code: 1
```

This is due to busybox wget in Alpine not supporting https URL's. Use
the installed curl instead.

jeid64/dcos,vishnu2kmohan/dcos,dcos/dcos,GoelDeepak/dcos,BenWhitehead/dcos,GoelDeepak/dcos,GoelDeepak/dcos,lingmann/dcos,BenWhitehead/dcos,mesosphere-mergebot/dcos,mesosphere-mergebot/mergebot-test-dcos,kensipe/dcos,vishnu2kmohan/dcos,mellenburg/dcos,mesosphere-mergebot/mergebot-test-dcos,mellenburg/dcos,jeid64/dcos,branden/dcos,kensipe/dcos,mesosphere-mergebot/dcos,asridharan/dcos,kensipe/dcos,BenWhitehead/dcos,asridharan/dcos,branden/dcos,asridharan/dcos,jeid64/dcos,mesosphere-mergebot/dcos,xinxian0458/dcos,amitaekbote/dcos,mnaboka/dcos,surdy/dcos,lingmann/dcos,GoelDeepak/dcos,jeid64/dcos,dcos/dcos,mnaboka/dcos,xinxian0458/dcos,lingmann/dcos,branden/dcos,asridharan/dcos,mnaboka/dcos,kensipe/dcos,surdy/dcos,mesosphere-mergebot/dcos,xinxian0458/dcos,dcos/dcos,mesosphere-mergebot/mergebot-test-dcos,darkonie/dcos,mesosphere-mergebot/mergebot-test-dcos,darkonie/dcos,lingmann/dcos,mellenburg/dcos,branden/dcos,amitaekbote/dcos,amitaekbote/dcos,mellenburg/dcos,xinxian0458/dcos,dcos/dcos,amitaekbote/dcos,darkonie/dcos,dcos/dcos,surdy/dcos,mnaboka/dcos,vishnu2kmohan/dcos,darkonie/dcos,BenWhitehead/dcos,vishnu2kmohan/dcos,darkonie/dcos,mnaboka/dcos,surdy/dcos