HADOOP-1607 [hbase shell] Clear screen command.
A src/contrib/hbase/src/java/org/apache/hadoop/hbase/shell/ClearCommand.java
Added.
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/shell/HBaseShell.jj
Add 'clear' command handling.
(clearCommand): Added.
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/shell/generated/Parser.java
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/shell/generated/ParserConstants.java
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/shell/generated/ParserTokenManager.java
Add 'clear' command handling (Generated by javacc).
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/shell/HelpContents.java
Add 'CLEAR' help.
M src/contrib/hbase/src/java/org/apache/hadoop/hbase/shell/HelpManager.java
Clear screen before outputting version string.
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