Fix typos on three comments and one message

Fixes typos on three comments and one message
in functions/functions-common

Change-Id: I2c926ca29b284afd4534b92860fa46f248676a83
diff --git a/functions b/functions
index ca5955e..34da1ba 100644
--- a/functions
+++ b/functions
@@ -410,7 +410,7 @@
     ip=$(echo "$nova_result" | grep "$network_name" | get_field 2)
     if [[ $ip = "" ]];then
         echo "$nova_result"
-        die $LINENO "[Fail] Coudn't get ipaddress of VM"
+        die $LINENO "[Fail] Couldn't get ipaddress of VM"
     fi
     echo $ip
 }