Investigate travis macOS build issue #612
Description
Some of the builds are failing/erroring on travis CI macOS builds: https://github.com/CiscoDevNet/ydk-gen/commits/master
https://travis-ci.org/CiscoDevNet/ydk-gen/builds
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Some of the builds are failing/erroring on travis CI macOS builds: https://github.com/CiscoDevNet/ydk-gen/commits/master
https://travis-ci.org/CiscoDevNet/ydk-gen/builds