Update for rally 0.8.1

Also add missing .gitreview file.

Ensure core snap is installed as this is required for classic
confinement mode snaps.

Change-Id: I9ff72de7c3bdd5b7ce51817506ad6af5267db42e

.gitreview

@@ -0,0 +1,4 @@
+[gerrit]
+host=review.openstack.org
+port=29418
+project=openstack/snap-rally.git

bindep.txt

@@ -1 +1,2 @@
 snapcraft [platform:dpkg]
+snapd [platform:dpkg]

snapcraft.yaml

@@ -1,5 +1,5 @@
 name: rally
-version: 0.7.0
+version: 0.8.1
 summary: OpenStack Benchmark-as-a-Service
 description: |
   Rally is a Benchmark-as-a-Service project for OpenStack.
@@ -33,7 +33,7 @@ parts:
   rally:
     plugin: python
     python-version: python2
-    source: http://tarballs.openstack.org/rally/rally-0.7.0.tar.gz
+    source: http://tarballs.openstack.org/rally/rally-$SNAPCRAFT_PROJECT_VERSION.tar.gz
     build-packages:
       - libffi-dev
       - libssl-dev

tox.ini

@@ -6,9 +6,13 @@ skipsdist = True
 basepython = python3.5
 install_command = pip install {opts} {packages}
 passenv = HOME TERM
+whitelist_externals =
+    sudo
+    snapcraft
 
 [testenv:snap]
 deps = -r{toxinidir}/requirements.txt
 commands =
+    sudo snap install core
     snapcraft clean
     snapcraft snap