Switch UserAgentClassifier's returned schema to tuple

When using current svn's pig, mobile_platform.pig failed with

        <file mobile_platform.pig, line 58, column 16> pig script failed to validate: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 0: Given UDF returns an improper Schema. Schema should only contain one field of a Tuple, Bag, or a single type. Returns: {chararray,chararray,chararray,chararray,chararray,chararray,chararray,chararray,boolean,chararray,chararray,chararray}

. We fix the output schema of Zero to return a tuple.

Change-Id: I813476135851e2d70e5f2129abbc73aa943e8d99
Add non_wmf_mobile_app handling to mobile_device_props.pig

mobile_device_props.pig did not yet have the non_wmf_mobile_app field,
so invoking the script fails. Hence, we add the field to make pig's and
UDF's schema match and filter the field out again afterwards.

Change-Id: I8198ed1c5b090a582fa059e1065b6c7556a0ec12
Since mobile jobs have been turned off, remove now unneded pig scripts

The mobile jobs output seems to be unused [1] and have hence been
turned off. We remove the corresponding (now unused) pig scripts, as
they depend on dclass, and would be in the way for the upcoming
removal of dclass.

[1] http://lists.wikimedia.org/pipermail/analytics/2014-March/001662.html

Change-Id: I13caedc40b43d01d005c299bd9e3088c1ba603c4
Drop dclass dependency from zero_country.pig script

zero_country.pig effectively does not use dclass, so we can drop the
dependency on it.

Change-Id: I06cc319b15548809e87a7a539e9887c13ec98e83