Added Oracle Linux distribution support

Enabled devstack to support oracle Linux Server

Change-Id: I1749cd3c7756a9903d2a0b0ab19606f87a4937d4
diff --git a/functions-common b/functions-common
index 44225ab..9093952 100644
--- a/functions-common
+++ b/functions-common
@@ -435,7 +435,9 @@
         else
             DISTRO="sle${os_RELEASE}sp${os_UPDATE}"
         fi
-    elif [[ "$os_VENDOR" =~ (Red Hat) || "$os_VENDOR" =~ (CentOS) ]]; then
+    elif [[ "$os_VENDOR" =~ (Red Hat) || \
+        "$os_VENDOR" =~ (CentOS) || \
+        "$os_VENDOR" =~ (OracleServer) ]]; then
         # Drop the . release as we assume it's compatible
         DISTRO="rhel${os_RELEASE::1}"
     elif [[ "$os_VENDOR" =~ (XenServer) ]]; then
@@ -463,7 +465,8 @@
         GetOSVersion
     fi
 
-    [ "$os_VENDOR" = "Fedora" ] || [ "$os_VENDOR" = "Red Hat" ] || [ "$os_VENDOR" = "CentOS" ]
+    [ "$os_VENDOR" = "Fedora" ] || [ "$os_VENDOR" = "Red Hat" ] || \
+        [ "$os_VENDOR" = "CentOS" ] || [ "$os_VENDOR" = "OracleServer" ]
 }