Drop scrypt library

While scrypt was revived after a period of no activity at all there is
no reason to keep it listed when no project is needing it.

Relates-to: https://wiki.openstack.org/wiki/Post_quantum_openstack

Depends-on: https://review.opendev.org/c/openstack/keystone/+/968442
Change-Id: I78a8f857a2e8b90c6f84978a45a7545d84ce1215
Signed-off-by: Artem Goncharov <artem.goncharov@gmail.com>

global-requirements.txt

@@ -159,8 +159,6 @@ ruamel.yaml  # MIT
 salt!=2019.2.1,!=2019.2.2  # Apache-2.0
 scikit-learn  # BSD
 scipy  # BSD
-# https://github.com/holgern/py-scrypt/issues/16
-scrypt!=0.8.21  # BSD
 semantic-version  # BSD
 setproctitle  # BSD
 SQLAlchemy  # MIT

openstack_requirements/tests/files/upper-constraints.txt

@@ -344,7 +344,6 @@ click===6.7
 docker-pycreds===0.2.1
 XStatic-smart-table===1.4.13.2
 kuryr-lib===0.3.0
-scrypt===0.8.0
 jsonpatch===1.15
 typed-ast===1.0.2;python_version=='3.4'
 typed-ast===1.0.2;python_version=='3.5'

upper-constraints.txt

@@ -431,7 +431,6 @@ jmespath===1.0.1
 click===8.3.0
 XStatic-smart-table===1.4.13.2
 kuryr-lib===3.3.1
-scrypt===0.9.4
 jsonpatch===1.33
 libsass===0.23.0
 os-testr===3.0.0