Revert "travis: filter out pyenv"

This reverts commit aa2e0f09ec.

Github-Pull: #11521
Rebased-From: 3d1c31126b
Tree-SHA512: 3c42bb2715853178f1fa950d7f0926a860a81b563606633cc58a67cf7218c80dd6545b9a89db387e6352b4caed38d7dd04d50c28547c340c032e2ba2f7c79173

.travis.yml

@@ -38,7 +38,6 @@ env:
 
 before_install:
     - export PATH=$(echo $PATH | tr ':' "\n" | sed '/\/opt\/python/d' | tr "\n" ":" | sed "s|::|:|g")
-    - export PATH=$(echo $PATH | tr ':' "\n" | sed '/\/opt\/pyenv/d' | tr "\n" ":" | sed "s|::|:|g")
 install:
     - if [ -n "$DPKG_ADD_ARCH" ]; then sudo dpkg --add-architecture "$DPKG_ADD_ARCH" ; fi
     - if [ -n "$PACKAGES" ]; then travis_retry sudo apt-get update; fi