changed python and gunicorn paths to be dynamic

bin/run_celery_worker_gevent

@@ -2,10 +2,17 @@
   curr_dir=$( dirname "${BASH_SOURCE[0]}" )
   cd $( dirname $curr_dir)
   source /etc/profile.d/treeherder.sh
-  source ../venv/bin/activate
 
   if [[ ${NEW_RELIC_LICENSE_KEY+isset} = isset ]]; then
     NEWRELIC_ADMIN="newrelic-admin run-program"
   fi
 
-  exec $NEWRELIC_ADMIN ../venv/bin/python manage.py celeryd -Q log_parser_fail,log_parser -P gevent --concurrency=10 -E --logfile=/var/log/celery/treeherder_worker_gevent.log -n gevent_worker.%h -l debug --maxtasksperchild=500
+  if [ -f ../venv/bin/python ]
+  then
+    source ../venv/bin/activate
+    PYTHON=../venv/bin/python
+  else
+    PYTHON=python
+  fi
+
+  exec $NEWRELIC_ADMIN $PYTHON manage.py celeryd -Q log_parser_fail,log_parser -P gevent --concurrency=10 -E --logfile=/var/log/celery/treeherder_worker_gevent.log -n gevent_worker.%h -l debug --maxtasksperchild=500

bin/run_gunicorn

@@ -11,9 +11,15 @@
   NUM_WORKERS=5
 
   source /etc/profile.d/treeherder.sh
-  source ../venv/bin/activate
 
-  exec ../venv/bin/gunicorn -w $NUM_WORKERS \
+  if [ -f ../venv/bin/gunicorn ]
+  then
+    source ../venv/bin/activate
+    GUNICORN=../venv/bin/gunicorn
+  else
+    GUNICORN=/usr/bin/gunicorn
+
+  exec $GUNICORN -w $NUM_WORKERS \
     --max-requests=2000 \
     --access-logfile=$ACCESS_LOGFILE \
     --error-logfile=$ERROR_LOGFILE treeherder.webapp.wsgi:application