ARROW-4373: [Packaging] Travis fails to deploy conda packages on OSX
ARROW-4373: [Packaging] Travis fails to deploy conda packages on OSX

It fixes the osx clang crossbow builds: https://travis-ci.org/kszucs/crossbow/builds/484341387

Author: Krisztián Szűcs <szucs.krisztian@gmail.com>

Closes #3486 from kszucs/ARROW-4373 and squashes the following commits:

760cdb3b <Krisztián Szűcs>  don't remove homebrew, because travis can't deploy without the ruby packages

kou/arrow,kou/arrow,wesm/arrow,laurentgo/arrow,pcmoritz/arrow,renesugar/arrow,itaiin/arrow,xhochy/arrow,icexelloss/arrow,itaiin/arrow,majetideepak/arrow,tebeka/arrow,pcmoritz/arrow,renesugar/arrow,xhochy/arrow,apache/arrow,icexelloss/arrow,itaiin/arrow,cpcloud/arrow,xhochy/arrow,kou/arrow,apache/arrow,laurentgo/arrow,wesm/arrow,icexelloss/arrow,pcmoritz/arrow,wesm/arrow,apache/arrow,renesugar/arrow,cpcloud/arrow,laurentgo/arrow,pcmoritz/arrow,apache/arrow,kou/arrow,pcmoritz/arrow,apache/arrow,icexelloss/arrow,kou/arrow,laurentgo/arrow,pcmoritz/arrow,laurentgo/arrow,apache/arrow,wesm/arrow,majetideepak/arrow,tebeka/arrow,pcmoritz/arrow,xhochy/arrow,itaiin/arrow,majetideepak/arrow,icexelloss/arrow,renesugar/arrow,pcmoritz/arrow,laurentgo/arrow,wesm/arrow,renesugar/arrow,wesm/arrow,renesugar/arrow,xhochy/arrow,pcmoritz/arrow,itaiin/arrow,icexelloss/arrow,xhochy/arrow,cpcloud/arrow,xhochy/arrow,majetideepak/arrow,kou/arrow,xhochy/arrow,icexelloss/arrow,itaiin/arrow,xhochy/arrow,apache/arrow,cpcloud/arrow,majetideepak/arrow,apache/arrow,renesugar/arrow,wesm/arrow,kou/arrow,laurentgo/arrow,laurentgo/arrow,icexelloss/arrow,pcmoritz/arrow,renesugar/arrow,renesugar/arrow,cpcloud/arrow,tebeka/arrow,tebeka/arrow,itaiin/arrow,renesugar/arrow,cpcloud/arrow,laurentgo/arrow,xhochy/arrow,pcmoritz/arrow,icexelloss/arrow,majetideepak/arrow,kou/arrow,itaiin/arrow,tebeka/arrow,itaiin/arrow,apache/arrow,renesugar/arrow,kou/arrow,renesugar/arrow,icexelloss/arrow,icexelloss/arrow,wesm/arrow,tebeka/arrow,xhochy/arrow,cpcloud/arrow,wesm/arrow,majetideepak/arrow,icexelloss/arrow,xhochy/arrow,majetideepak/arrow,laurentgo/arrow,icexelloss/arrow,pcmoritz/arrow,tebeka/arrow,xhochy/arrow,cpcloud/arrow,itaiin/arrow,laurentgo/arrow,tebeka/arrow,laurentgo/arrow,renesugar/arrow,apache/arrow,laurentgo/arrow,wesm/arrow,apache/arrow,pcmoritz/arrow,kou/arrow,majetideepak/arrow,cpcloud/arrow,majetideepak/arrow,pcmoritz/arrow,kou/arrow,renesugar/arrow,cpcloud/arrow,cpcloud/arrow,majetideepak/arrow,renesugar/arrow,cpcloud/arrow,wesm/arrow,wesm/arrow,wesm/arrow,cpcloud/arrow,kou/arrow,itaiin/arrow,cpcloud/arrow,itaiin/arrow,icexelloss/arrow,itaiin/arrow,apache/arrow,majetideepak/arrow,laurentgo/arrow,itaiin/arrow,apache/arrow,wesm/arrow,majetideepak/arrow,apache/arrow,xhochy/arrow,pcmoritz/arrow,itaiin/arrow,majetideepak/arrow,kou/arrow,kou/arrow,majetideepak/arrow,tebeka/arrow,laurentgo/arrow,xhochy/arrow,tebeka/arrow