Removed I2U2

<!-- 21 I2U2 -->
<groupMapping name='i2u2' accountingVo='i2u2' accountingDesc='I2U2'>
    <userGroup className='gov.bnl.gums.VOMSGroup'
    url='https://voms.fnal.gov:8443/voms/i2u2/services/VOMSAdmin'
    persistenceFactory='mysql'
    name='i2u2'
    voGroup="/i2u2"
    sslCertfile='/etc/grid-security/http/httpcert.pem'
    sslKey='/etc/grid-security/http/httpkey.pem'
    matchFQAN="vo" acceptProxyWithoutFQAN='true' />
    <accountMapping className='gov.bnl.gums.GroupAccountMapper'
    groupName='i2u2' />
</groupMapping>

Remove I2U2 from hostGroup className