Adding HA support for Keystone charm

Change-Id: I691154ef2952bc124d7ddb689e39455c213c2a4b
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>
diff --git a/installers/charm/keystone/.gitignore b/installers/charm/keystone/.gitignore
index 2545cca..97fc8b4 100644
--- a/installers/charm/keystone/.gitignore
+++ b/installers/charm/keystone/.gitignore
@@ -12,5 +12,6 @@
 #     See the License for the specific language governing permissions and
 #     limitations under the License.
 .vscode
+.tox
 build
 keystone.charm
\ No newline at end of file