[x] Doc about explicitAttrs and static attrs should be updated
this PR implements the following behaviour:
Si explicitAttrs=true, No filtra statics
Si explicitAttrs=false, No filtra statics
Si explicitAttrs= expresion o array, si filtra statics (como el resto de atributos)
fix for https://github.com/telefonicaid/iotagent-node-lib/issues/1506
[x] Doc about explicitAttrs and static attrs should be updated
this PR implements the following behaviour: