Make hoodie run on travis-ci

Test logs > 4MB, which is a limit for travis-ci. Reducing the logs by setting appropriate log levels for tests
Add sudo: required on travis.yml to get more memory for running the tests. (https://github.com/travis-ci/travis-ci/issues/5926)
Fixed requirement that fsclient.lastDataFileForDataset always returns files in order

hoodie-client/src/test/resources/log4j-surefire.properties

@@ -5,7 +5,7 @@
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
-#          http://www.apache.org/licenses/LICENSE-2.0
+#           http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ -13,9 +13,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+log4j.rootLogger=WARN, A1
+log4j.category.com.uber=INFO
+log4j.category.org.apache.parquet.hadoop=WARN
 
-# Set root logger level to DEBUG and its only appender to A1.
-log4j.rootLogger=INFO, A1
 # A1 is set to be a ConsoleAppender.
 log4j.appender.A1=org.apache.log4j.ConsoleAppender
 # A1 uses PatternLayout.