`st2 pack install` will ignore failures when installing multiple packs

SUMMARY

If I attempt to install multiple packs using st2 pack install, and one of those packs is non-existent, it will silently ignore the failure.

ISSUE TYPE

• Bug Report

STACKSTORM VERSION

st2 3.0dev (d86747c), on Python 2.7.12

OS / ENVIRONMENT / INSTALL METHOD

one-line install.

STEPS TO REPRODUCE

extreme@ubuntu:~$ st2 pack install foobar acos

For the "foobar, acos" packs, the following content will be registered:

rules     |  0
sensors   |  0
aliases   |  0
actions   |  19
triggers  |  0

Installation may take a while for packs with many items.

	[ succeeded ] download pack
	[ succeeded ] make a prerun
	[ succeeded ] install pack dependencies
	[ succeeded ] register pack

+-------------+-----------------------------------------------+
| Property    | Value                                         |
+-------------+-----------------------------------------------+
| name        | acos                                          |
| description | Manage ACOS-based appliances of A10 Networks. |
| version     | 0.2.5                                         |
| author      | Hiroyasu OHYAMA                               |
+-------------+-----------------------------------------------+
extreme@ubuntu:~$

EXPECTED RESULTS

I expected some error message about "pack foobar not found", similar to if I had just tried st2 pack install foobar

ACTUAL RESULTS

Install completes 'successfully', since one pack install works.

Start by reproducing st2 pack install foobar acos and compare it with st2 pack install foobar. Trace the st2 pack install entry point and its handling of multiple pack names. Done means a missing pack produces an error while the valid pack's installation result remains reported.