Fix typos for stack.sh and lib of comments and message

Fix 10 comments and 1 message

stack.sh
  Certicate => Certificate (comment)
lib/stack
  Sentinal => Sentinel (comment)
lib/neutron-legacy
  overriden => overridden (comment)
  necesssary => necessary (comment)
  notifiy => notify (message)
  notifations => notifications (comment)
lib/rpc_backend
  orginal => original (comment)
  cofiguration => configuration (comment)
lib/stack
  confgured => configured (comment)
lib/swift
  additinal => additional (comment)
  calclution => calculation (comment)
  maximun => maximum (comment)

Change-Id: I3637388b67decb007cd49af9addecc654009559b
diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index c244e54..a38b1c1 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -256,7 +256,7 @@
 
 # If using GRE tunnels for tenant networks, specify the range of
 # tunnel IDs from which tenant networks are allocated. Can be
-# overriden in ``localrc`` in necesssary.
+# overridden in ``localrc`` in necessary.
 TENANT_TUNNEL_RANGES=${TENANT_TUNNEL_RANGES:-1:1000}
 
 # To use VLANs for tenant networks, set to True in localrc. VLANs
@@ -537,7 +537,7 @@
 
     if is_provider_network; then
         die_if_not_set $LINENO PHYSICAL_NETWORK "You must specify the PHYSICAL_NETWORK"
-        die_if_not_set $LINENO PROVIDER_NETWORK_TYPE "You must specifiy the PROVIDER_NETWORK_TYPE"
+        die_if_not_set $LINENO PROVIDER_NETWORK_TYPE "You must specify the PROVIDER_NETWORK_TYPE"
         NET_ID=$(neutron net-create $PHYSICAL_NETWORK --tenant_id $TENANT_ID --provider:network_type $PROVIDER_NETWORK_TYPE --provider:physical_network "$PHYSICAL_NETWORK" ${SEGMENTATION_ID:+--provider:segmentation_id $SEGMENTATION_ID} --shared | grep ' id ' | get_field 2)
         die_if_not_set $LINENO NET_ID "Failure creating NET_ID for $PHYSICAL_NETWORK $TENANT_ID"
 
@@ -1123,7 +1123,7 @@
     iniset $NEUTRON_CONF DEFAULT auth_strategy $Q_AUTH_STRATEGY
     _neutron_setup_keystone $NEUTRON_CONF keystone_authtoken
 
-    # Configuration for neutron notifations to nova.
+    # Configuration for neutron notifications to nova.
     iniset $NEUTRON_CONF DEFAULT notify_nova_on_port_status_changes $Q_NOTIFY_NOVA_PORT_STATUS_CHANGES
     iniset $NEUTRON_CONF DEFAULT notify_nova_on_port_data_changes $Q_NOTIFY_NOVA_PORT_DATA_CHANGES