Robustize OS Detection.

This is framework needed to support Ubuntu 16.04 which
is coming in a future commit.

scripts/removeOVPN.sh

@@ -64,7 +64,7 @@ if [ $REVOKE_STATUS == 0 ]; then
         printf "\nThis seems to be the first time you have revoked a cert.\n"
         printf "We are adding the CRL to the server.conf and restarting openvpn.\n"
         sed -i '/#crl-verify/c\crl-verify /etc/openvpn/crl.pem' /etc/openvpn/server.conf
-        if [[ ${PLAT} == "ubuntu" ]]; then
+        if [[ ${PLAT} == "Ubuntu" ]]; then
             service openvpn restart
         else
             systemctl restart openvpn.service

scripts/uninstall.sh

@@ -81,7 +81,7 @@ echo ":::"
     $SUDO rm -rf /var/log/*openvpn* &> /dev/null
     if [[ $UINST_OVPN = 1 ]]; then
         $SUDO rm -rf /etc/openvpn &> /dev/null
-        if [[ $PLAT = "ubuntu" ]]; then
+        if [[ $PLAT = "Ubuntu" ]]; then
             printf "::: Removing openvpn apt source..."
             $SUDO rm -rf /etc/apt/sources.list.d/swupdate.openvpn.net.list &> /dev/null
             $SUDO apt-get -qq update & spinner $!; printf "done!\n";