adjusted env var in setup.py to work with hammer deploys

CHANGELOG.txt

@@ -1,3 +1,6 @@
+[OPTORO INTERNAL] AIRFLOW 1.10.2, 2018-12-03
+Added os.environ["SLUGIFY_USES_TEXT_UNIDECODE"] = "yes" to setup.py to get around not being able to specify it while building with mc-hammer.
+
 AIRFLOW 1.10.1, 2018-11-13
 
 New features:

airflow/version.py

@@ -18,4 +18,4 @@
 # under the License.
 #
 
-version = '1.10.1'
+version = '1.10.2'

setup.py

@@ -36,13 +36,13 @@
 
 # See LEGAL-362
 def verify_gpl_dependency():
-    # The Read the Docs build environment [1] does a pip install of Airflow which cannot
-    # be overridden with custom environment variables, so we detect the READTHEDOCS env
-    # var they provide to set the env var that avoids the GPL dependency on install when
-    # building the docs site.
-    # [1]: http://docs.readthedocs.io/en/latest/builds.html#build-environment
-    if os.getenv("READTHEDOCS") == "True":
-        os.environ["SLUGIFY_USES_TEXT_UNIDECODE"] = "yes"
+    """
+    Deploying Airflow with mc-hammer doesn't allow the setting
+    of arbitrary env vars before Airflow is installed. By making
+    SLUGIFY_USES_TEXT_UNIDECODE the default, we're hoping to get
+    around this.
+    """
+    os.environ["SLUGIFY_USES_TEXT_UNIDECODE"] = "yes"
 
     if (not os.getenv("AIRFLOW_GPL_UNIDECODE")
             and not os.getenv("SLUGIFY_USES_TEXT_UNIDECODE") == "yes"):