Entry in online.xml

Counters of this kind are introduced to Online by such an entry in /online_dir/online.xml:

<device>
 <name>exp_doris</name>
 <tags>expert,user</tags>
 <type>counter</type>
 <module>counter_tango</module>
 <device>p09/vcexecutor/doris.01</device>
 <control>tango</control>
 <hostname>haso107klx:10000</hostname>
</device>

<device>
 <name>exp_petra</name>
 <tags>expert,user</tags>
 <type>counter</type>
 <module>counter_tango</module>
 <device>p09/vcexecutor/petra.01</device>
 <control>tango</control>
 <hostname>haso107klx:10000</hostname>
</device>