Fix svlan_creation_untagged_pvid.xml.pyformat in PROV_SC_02

<?xml version="1.0"?>

<nc:config xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0">

    <interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces">

        <interface>

            <name>{port1_name}</name>

            <bridge-port xmlns="urn:ieee:std:802.1Q:yang:ieee802-dot1q-bridge">

                <pvid>{svid}</pvid>

            </bridge-port>

        </interface>

    </interfaces>

</nc:config>