Enforce function declaration format in bash8

Check that function calls look like ^function foo {$ in bash8, and fix
all existing failures of that check.  Add a note to HACKING.rst

Change-Id: Ic19eecb39e0b20273d1bcd551a42fe400d54e938
diff --git a/lib/cinder_plugins/XenAPINFS b/lib/cinder_plugins/XenAPINFS
index 72e1c13..fa10715 100644
--- a/lib/cinder_plugins/XenAPINFS
+++ b/lib/cinder_plugins/XenAPINFS
@@ -27,7 +27,7 @@
 # ------------
 
 # configure_cinder_driver - Set config files, create data dirs, etc
-function configure_cinder_driver() {
+function configure_cinder_driver {
     iniset $CINDER_CONF DEFAULT volume_driver "cinder.volume.drivers.xenapi.sm.XenAPINFSDriver"
     iniset $CINDER_CONF DEFAULT xenapi_connection_url "$CINDER_XENAPI_CONNECTION_URL"
     iniset $CINDER_CONF DEFAULT xenapi_connection_username "$CINDER_XENAPI_CONNECTION_USERNAME"
diff --git a/lib/cinder_plugins/glusterfs b/lib/cinder_plugins/glusterfs
index a0c5ae8..b4196e4 100644
--- a/lib/cinder_plugins/glusterfs
+++ b/lib/cinder_plugins/glusterfs
@@ -27,7 +27,7 @@
 # ------------
 
 # configure_cinder_driver - Set config files, create data dirs, etc
-function configure_cinder_driver() {
+function configure_cinder_driver {
     # To use glusterfs, set the following in localrc:
     # CINDER_DRIVER=glusterfs
     # CINDER_GLUSTERFS_SHARES="127.0.0.1:/vol1;127.0.0.1:/vol2"
diff --git a/lib/cinder_plugins/nfs b/lib/cinder_plugins/nfs
index ea2c9ce..2d9d875 100644
--- a/lib/cinder_plugins/nfs
+++ b/lib/cinder_plugins/nfs
@@ -27,7 +27,7 @@
 # ------------
 
 # configure_cinder_driver - Set config files, create data dirs, etc
-function configure_cinder_driver() {
+function configure_cinder_driver {
     iniset $CINDER_CONF DEFAULT volume_driver "cinder.volume.drivers.nfs.NfsDriver"
     iniset $CINDER_CONF DEFAULT nfs_shares_config "$CINDER_CONF_DIR/nfs_shares.conf"
     echo "$CINDER_NFS_SERVERPATH" | sudo tee "$CINDER_CONF_DIR/nfs_shares.conf"
diff --git a/lib/cinder_plugins/sheepdog b/lib/cinder_plugins/sheepdog
index 4435932..30c60c6 100644
--- a/lib/cinder_plugins/sheepdog
+++ b/lib/cinder_plugins/sheepdog
@@ -27,7 +27,7 @@
 # ------------
 
 # configure_cinder_driver - Set config files, create data dirs, etc
-function configure_cinder_driver() {
+function configure_cinder_driver {
     iniset $CINDER_CONF DEFAULT volume_driver "cinder.volume.drivers.sheepdog.SheepdogDriver"
 }
 
diff --git a/lib/cinder_plugins/solidfire b/lib/cinder_plugins/solidfire
index 47c113e..2c970b5 100644
--- a/lib/cinder_plugins/solidfire
+++ b/lib/cinder_plugins/solidfire
@@ -27,7 +27,7 @@
 # ------------
 
 # configure_cinder_driver - Set config files, create data dirs, etc
-function configure_cinder_driver() {
+function configure_cinder_driver {
     # To use solidfire, set the following in localrc:
     # CINDER_DRIVER=solidfire
     # SAN_IP=<mvip>
diff --git a/lib/cinder_plugins/vsphere b/lib/cinder_plugins/vsphere
index c8cab6a..436b060 100644
--- a/lib/cinder_plugins/vsphere
+++ b/lib/cinder_plugins/vsphere
@@ -27,7 +27,7 @@
 # ------------
 
 # configure_cinder_driver - Set config files, create data dirs, etc
-function configure_cinder_driver() {
+function configure_cinder_driver {
     iniset $CINDER_CONF DEFAULT vmware_host_ip "$VMWAREAPI_IP"
     iniset $CINDER_CONF DEFAULT vmware_host_username "$VMWAREAPI_USER"
     iniset $CINDER_CONF DEFAULT vmware_host_password "$VMWAREAPI_PASSWORD"