[build] fix pip install issues on OSX High Sierra (#6201)

* [build] fix pip install issues on OSX High Sierra

I think requirements.txt was out-of-sync as well.

Also had to:
export
  LDFLAGS="-L/usr/local/opt/openssl/lib"
export
  CPPFLAGS="-I/usr/local/opt/openssl/include"
export
  PKG_CONFIG_PATH="/usr/local/opt/openssl/lib/pkgconfig"

* Fix click

setup.py

@@ -57,6 +57,7 @@ setup(
         'boto3==1.4.7',
         'botocore>=1.7.0, <1.8.0',
         'celery>=4.2.0',
+        'click>=6.0, <7.0.0',  # click >=7 forces "-" instead of "_"
         'colorama',
         'contextlib2',
         'cryptography',
@@ -82,7 +83,7 @@ setup(
         'pyhive>=0.4.0',
         'python-dateutil',
         'python-geohash',
-        'pyyaml>=3.11',
+        'pyyaml>=3.13',
         'requests',
         'simplejson>=3.15.0',
         'sqlalchemy',