Bump sqlalchemy minimum version to 1.1.0

Sqlalchemy add a new class for hybrid property in v1.1.0[1]. It
can solve the password length problem for User password SQL obj.

[1]: https://docs.sqlalchemy.org/en/latest/changelog/migration_11.html#change-3653

Change-Id: I7a18bd528607ec5112cc55c7682f95d61be8b509
Closes-bug: #1735250

keystone/tests/unit/identity/test_backends.py

@@ -374,6 +374,12 @@ class IdentityTests(object):
                           PROVIDERS.identity_api.delete_user,
                           uuid.uuid4().hex)
 
+    def test_create_user_with_long_password(self):
+        user = unit.new_user_ref(domain_id=CONF.identity.default_domain_id,
+                                 password='a' * 2000)
+        # success create a user with long password
+        PROVIDERS.identity_api.create_user(user)
+
     def test_create_user_missed_password(self):
         user = unit.new_user_ref(domain_id=CONF.identity.default_domain_id)
         user = PROVIDERS.identity_api.create_user(user)

lower-constraints.txt

@@ -57,7 +57,7 @@ scrypt==0.8.0
 six==1.10.0
 Sphinx==1.6.5
 sqlalchemy-migrate==0.11.0
-SQLAlchemy==1.0.13
+SQLAlchemy==1.1.0
 stestr==1.0.0
 stevedore==1.20.0
 tempest==17.1.0

releasenotes/notes/bug-1735250-b60332a7f288cf94.yaml

@@ -0,0 +1,8 @@
+---
+fixes:
+  - |
+    [`bug 1734244 <https://bugs.launchpad.net/keystone/+bug/1735250>`_]
+    Users can't set password longer than 128 if Keystone using
+    `Sqlalchemy` < 1.1.0. Update `Sqlalchemy` to a higher version can solve
+    this problem.
+    [`Related Sqlalchemy Changelog <https://docs.sqlalchemy.org/en/latest/changelog/migration_11.html#change-3653>`_].

requirements.txt

@@ -12,7 +12,7 @@ Flask!=0.11,>=1.0.2  # BSD
 Flask-RESTful>=0.3.5  # BSD
 cryptography>=2.1 # BSD/Apache-2.0
 six>=1.10.0 # MIT
-SQLAlchemy>=1.0.13 # MIT
+SQLAlchemy>=1.1.0 # MIT
 sqlalchemy-migrate>=0.11.0 # Apache-2.0
 stevedore>=1.20.0 # Apache-2.0
 passlib>=1.7.0 # BSD