Delete existing vpn certs if needed

src/freedombone-app-vpn

     echo $"Creating VPN key for $username"
 
     cd /etc/openvpn/easy-rsa
+
+    if [ -f /etc/openvpn/easy-rsa/keys/$username.crt ]; then
+        rm /etc/openvpn/easy-rsa/keys/$username.crt
+    fi
+    if [ -f /etc/openvpn/easy-rsa/keys/$username.key ]; then
+        rm /etc/openvpn/easy-rsa/keys/$username.key
+    fi
+    if [ -f /etc/openvpn/easy-rsa/keys/$username.csr ]; then
+        rm /etc/openvpn/easy-rsa/keys/$username.csr
+    fi
+
     echo '
 
 
         exit 7392353
     fi
     cp openssl-${vpn_openssl_version}.cnf openssl.cnf
+
+    if [ -f /etc/openvpn/easy-rsa/keys/${OPENVPN_SERVER_NAME}.crt ]; then
+        rm /etc/openvpn/easy-rsa/keys/${OPENVPN_SERVER_NAME}.crt
+    fi
+    if [ -f /etc/openvpn/easy-rsa/keys/${OPENVPN_SERVER_NAME}.key ]; then
+        rm /etc/openvpn/easy-rsa/keys/${OPENVPN_SERVER_NAME}.key
+    fi
+    if [ -f /etc/openvpn/easy-rsa/keys/${OPENVPN_SERVER_NAME}.csr ]; then
+        rm /etc/openvpn/easy-rsa/keys/${OPENVPN_SERVER_NAME}.csr
+    fi
+
     echo '