Need additional Documentation for lookupByClass method

[praveent78]

**queryparams indicates that a dictionary needs to be passed. However, there is more to
this as Timm explained to me over Jabber. Additional documentation is needed to help
clear the confusion to not use a dictionary in the raw form.

For example: if I want to query a tenant with the filter on Name.

Incorrect Query I tried:
moDir.lookupByClass("fvTenant", parentDn= "uni", {'name':'Tenant1'})

Correct Query:
moDir.lookupByClass("fvTenant", propFilter='and(eq(fvTenant.name, "Tenant1"))')

[kecorbin]

+1 on this. Thanks for raising this issue @praveent78 this helped me work through same.

[robphoenix]

Is this closed by #119?