[train-only] Update train CI

Updates:
- install cinder from train-em tag instead of master
- install os-brick from final train release instead of master
- use train upper constraints file
- remove cinderlib-lvm-functional job (see change If039438a8e84)
- remove cinderlib-ceph-functional job (I think the problem is a
  python 2/3 compatability issue with ansible)

This leaves the stable/train CI running only unit tests and pep8,
which is the bare minimum before a branch must go EOL.

Change-Id: Ibd9f425e2cb7fa1fb9d4e5461ea7379093534638

.zuul.yaml

@@ -9,9 +9,6 @@
         - cinderlib-tox-py27
         - cinderlib-tox-py36
         - cinderlib-tox-py37
-
-        - cinderlib-lvm-functional
-        - cinderlib-ceph-functional
     gate:
       queue: integrated
       jobs:
@@ -19,9 +16,6 @@
         - cinderlib-tox-py27
         - cinderlib-tox-py36
         - cinderlib-tox-py37
-
-        - cinderlib-lvm-functional
-        - cinderlib-ceph-functional
     post:
       jobs:
         - publish-openstack-python-branch-tarball

tox.ini

@@ -15,9 +15,10 @@ install_command = pip install {opts} {packages}
 # overwrite the package installed by Zuul on jobs supporting cross-project
 # dependencies (include Cinder in required-projects).  This allows us to also
 # run local tests against master.
-deps= -r{toxinidir}/test-requirements.txt
-      git+https://opendev.org/openstack/os-brick#egg=os-brick
-      git+https://opendev.org/openstack/cinder#egg=cinder
+deps= -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/train}
+      -r{toxinidir}/test-requirements.txt
+      os-brick==2.10.7
+      git+https://opendev.org/openstack/cinder@train-em#egg=cinder
 
 commands =
     find . -ignore_readdir_race -type f -name "*.pyc" -delete