HBASE-16227 [Shell] Column value formatter not working in scans.

Tested : manually using shell.

Change-Id: I9eef7efa68393a762ec872447f8e36dfc6d6f1bc

hbase-shell/src/main/ruby/hbase/table.rb

@@ -452,6 +452,9 @@ EOF
         # This will overwrite any startrow/stoprow settings
         scan.setRowPrefixFilter(rowprefixfilter.to_java_bytes) if rowprefixfilter
 
+        # Clear converters from last scan.
+        @converters.clear()
+
         columns.each do |c|
           family, qualifier = parse_column_name(c.to_s)
           if qualifier
@@ -503,8 +506,6 @@ EOF
       count = 0
       res = {}
 
-      @converters.clear()
-
       # Start the scanner
       scan = scan == nil ? _hash_to_scan(args) : scan
       scanner = @table.getScanner(scan)