Remove setup steps unecessary when travis runs on darwin
Remove setup steps unecessary when travis runs on darwin

Many of the setup/dev programs installed are not used because no testing
is executed on GOOS=darwin builds. Makes sense to remove them and make
darwin runs much shorter.

Signed-off-by: Phil Estes <dbac1f450dc8326caa7ba104b384a0eca642250c@linux.vnet.ibm.com>

containerd/containerd,crosbymichael/containerd,miaoyq/containerd,thaJeztah/containerd,mikebrow/containerd,containerd/containerd,mikebrow/containerd,estesp/containerd,miaoyq/containerd,vdemeester/containerd,dmcgowan/containerd,dmcgowan/containerd,thaJeztah/containerd,estesp/containerd,crosbymichael/containerd,vdemeester/containerd