Move crc16 to requirements

Change I8587012c916b2108d620e8d293da6ddb8e3fc39f added crc16 to
global-requirements because of dragonflow, so use it properly.

Since crc16 is in global-requirements, remove it from tox_install
and devstack/redis_driver, add it to requirements.

Note that this is following the common OpenStack requirements process
as documented at http://docs.openstack.org/developer/requirements/

Change-Id: I5301083ceb7716c84f5f373d53f385018f092a9c

devstack/redis_driver

@@ -44,7 +44,6 @@ function configure_redis {
 }
 
 function nb_db_driver_install_server {
-    sudo pip install crc16
 
     if is_service_enabled df-redis-server ; then
         echo "Installing rediscluster"

requirements.txt

@@ -18,3 +18,5 @@ oslo.i18n>=2.1.0 # Apache-2.0
 oslo.log>=1.14.0 # Apache-2.0
 oslo.reports>=0.6.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0
+crc16>=0.1.1  # LGPLv3+
+

tools/tox_install.sh

@@ -41,5 +41,4 @@ fi
 
 pip install -U $*
 pip install python-etcd
-pip install 'crc16>=0.1.1'
 exit $?