Support RHEL with lsb_release

Consider all distributor as "Red Hat" which id matches to the Red.*Hat regexp.

Example Distributor ID: "RedHatEnterpriseServer"

Change-Id: I29cc2e83cccaafa3e1e056e506fda5c9771764a1
diff --git a/functions b/functions
index 80e1796..55a81c5 100644
--- a/functions
+++ b/functions
@@ -224,6 +224,7 @@
         os_VENDOR=$(lsb_release -i -s)
         os_RELEASE=$(lsb_release -r -s)
         os_UPDATE=""
+        os_PACKAGE="rpm"
         if [[ "Debian,Ubuntu" =~ $os_VENDOR ]]; then
             os_PACKAGE="deb"
         elif [[ "SUSE LINUX" =~ $os_VENDOR ]]; then
@@ -231,9 +232,8 @@
             if [[ $? -eq 0 ]]; then
                 os_VENDOR="openSUSE"
             fi
-            os_PACKAGE="rpm"
-        else
-            os_PACKAGE="rpm"
+        elif [[ $os_VENDOR =~ Red.*Hat ]]; then
+            os_VENDOR="Red Hat"
         fi
         os_CODENAME=$(lsb_release -c -s)
     elif [[ -r /etc/redhat-release ]]; then