Bug 11480: Fix invalid assumptions in JSONStream test

Bug 11480: Fix invalid assumptions in JSONStream test

Tests for C4::Output::JSONStream made the invalid assumption
that the hash keys of the modules internal structure
will always be returned in the same sequence.
A hash is an unordered structure. as of perl 5.18
this has beem reinforced by random seeding of the
hashing function. See the info in perldelta and
the doc for JSON.

This patch changes the tests to be sequence-neutral
where the previous test was testing that a new element
was added and an existing one was untouched these have
been separated into individual tests.

Some typos in the messages have been corrected

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Test Plan

1/ Run t/Output_JSONStream.t , 8 tests should pass (or perhaps fail,
   but inconsistently under perl 5.18 or greater)
2/ Apply patch
3/ Run t/Output_JSONStream.t 10 tests should pass now

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>