fetch2/npm: properly handle npm dependencies

The output of "npm view dependencies" isn't entirely JSON if there are
multiple results, but the code here was just discarding the output if
the entire thing didn't parse as JSON. Split the output into lines and
iterate over it, parsing JSON fragments as we find them; this way we end
up with the last package's dependencies since it'll be last in the
output.

Digging further, it seems that the dependencies field reported by "npm
view" also includes optional dependencies. That wouldn't be a problem
except some of these optional dependencies may be OS-specific; for
example the "chokidar" module has "fsevents" in its optional
dependencies, but fsevents only works on MacOS X (and is only needed
there). If we erroneously pull in fsevents, not only is it unnecessary
but it causes "npm shrinkwrap" to throw a tantrum. In the absence of a
better approach, look at the os field and discard the module (along with
any of its dependencies) if it isn't for Linux.

As part of this, we can reduce the calls to npm view to one per package
since we get the entire json output rather than querying twice for two
separate fields. Overall the time taken has probably increased since we
are being more thorough about dependencies, but it's not quite as bad as
it could have been.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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