descriptor key check updated

Get key for VNF Descriptor

    FOR    ${key}    IN    @{topology_template.node_templates.keys()} 

        Log    ${key}

        ${check1}=    Run Keyword And Return Status    Should End With    ${key}    VNF

        ${check1}=    Run Keyword And Return Status    Should Be Equal As Strings    ${topology_template.node_templates.${key}.type}    tosca.nodes.nfv.VNF

        Run Keyword If     ${check1}     Set Global Variable    ${vnfKey}    ${key}   

    END

 No newline at end of file