Fixed Issues in HDFS

Review the list of HDFS issues that are resolved in Cloudera Runtime 7.2.16.

CDPD-27239: This commit reverts HDFS-13671, which was meant to reduce NameNode heap consumption, but it occasionally causes severe performance problems for some users, and that it does not go away without restarting the process. The revert will stabilize the NameNode performance for these users.

OPSAPS-63529: The users now can specify if they want the automatic rebootstrapping in case of HDFS incremental replications in the case of replication failure from the UI.