Non-interactive missing for the hbase-shell

During test 2.4.12, we found a lot of our integration testing failure for the non-interactive mode in hbase-shell, looks like in 2.4.12, we removed the "shell.eval_io" for the non-interactive shell, this caused the input/output handle behavior for shell is the same for interactive and non-interactive which caused unexpected error, for example:

```

echo -e "disable_all '.*'\ny" | hbase shell -n

=====Old version 2.4.4=====

t1

Disable the above 1 tables (y/n)?

1 tables successfully disabled
Took 0.7811 seconds

=====New version 2.4.12=====

hbase:001:0> disable_all '.*'t1
test_tableDisable the above 2 tables (y/n)?
Took 0.5270 seconds

NoMethodError: undefined method `chomp' for nil:NilClass
command at uri:classloader:/shell/commands/disable_all.rb:41
command_safe at uri:classloader:/shell/commands.rb:49
translate_hbase_exceptions at uri:classloader:/shell/commands.rb:122
command_safe at uri:classloader:/shell/commands.rb:49
....
run at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/irb.rb:427
<main> at classpath:/jar-bootstrap.rb:223}}

```