Fix up source codes to be compiled with Guava 17.0

Removing usage of Guava's deprecated or missing methods in recent version(17.0) without updating pom file. This JIRA targets branch-2. On this JIRA, org.apache.hadoop.util.LimitInputStream will be used instead of com.google.common.io.LimitInputStream which is removed in Guava 15.0.

In the latest release of Guava(18.0), following changes are done:

• Objects#ToStringHelper was removed and we need to use MoreObjects#ToStringHelper. However, MoreObjects#ToStringHelper has been introduced since 18.0.
• Enums.valueOfFunction was removed and need to be replaced with Enums.stringConverter. However, MoreObjects#ToStringHelper has been introduced since 16.0.
• MoreExecutors.sameThreadExecutor() was removed at 18.0 and need to be replaced with MoreExecutors.newDirectExecutorService. However, MoreExecutors.newDirectExecutorService has been introduced since 18.0.

We'll do these changes on HADOOP-10101.