Enable vault devstack functional test by default

Update the vault to latest release(0.10.3).

I can volunteer to be the vault plugin maintainer.
my IRC name: lxkong
my email address: anlin.kong@gmail.com

Change-Id: Iff05d55545da258c40bf101279510d37b6996d45

.zuul.yaml

@@ -170,6 +170,7 @@
         - barbican-dogtag-devstack-functional-fedora-27
         - barbican-kmip-devstack-functional:
             voting: false
+        - barbican-vault-devstack-functional
         - grenade-devstack-barbican
         # TripleO jobs that deploy Barbican.
         # Note we don't use a project-template here, so it's easier
@@ -193,9 +194,9 @@
         - barbican-kmip-devstack-functional:
             voting: false
         - barbican-dogtag-devstack-functional-fedora-27
+        - barbican-vault-devstack-functional
         - grenade-devstack-barbican
         - openstack-tox-lower-constraints
     experimental:
       jobs:
         - barbican-simple-crypto-devstack-tempest-py35
-        - barbican-vault-devstack-functional

devstack/lib/barbican

@@ -574,8 +574,8 @@ function install_dogtag_components {
 # ----------------
 
 function install_vault {
-    wget https://releases.hashicorp.com/vault/0.10.1/vault_0.10.1_linux_amd64.zip
-    unzip vault_0.10.1_linux_amd64.zip
+    wget https://releases.hashicorp.com/vault/0.10.3/vault_0.10.3_linux_amd64.zip
+    unzip vault_0.10.3_linux_amd64.zip
     sudo mv vault /usr/bin
     install_package screen
     screen -d -m bash -c "vault server -dev -dev-listen-address=${HOST_IP}:8200 2>&1 >vault.log"