Changes

osmo-msc: Use osmo-mgw instead of osmo-bsc_mgcp
osmo-msc now requires osmo-mgw and it's not expected to work properly 
anymore with old mgcp code.
Change-Id: I93033f7b6133a4914f12f37511ad870b3dea3201

osmo-trx: Add cfg template
Since commit 3da1f8352e337fb032bf7a58c2909d3ba918e237, osmo-trx requires 
a cfg file to start successfully.
Change-Id: I8f0e0d0a9fa849f41c3cccc4059431f62f956eac

jenkins: use env POKY_VERSION POKY_PATH to find poky
Instead of hardcoded values, use defaults and allow jenkins to override 
the defaults.
Change-Id: I1403b32cdf30420f3b02c41c2627b71fcbeae9ab

jenkins: update poky version 2.3.2
The sysmobts 2017 releases are using poky 2.3.2
Change-Id: If6e8a5702e4c9b24e758e3aa5f390e786c51c384

contrib: build-osmo-bts: Remove dropped dependency openbsc
Since osmo-bts ec33b0397f5d71248c5834513d4be7b9b0e46366, it doesn't 
require openbsc anymore to build.
Change-Id: I8a1918971388afad41308629c1851614d1381f25

contrib: build-osmo-bsc: Add aibsip-find and ipaccess-config binaries to
archive
They will be required by Nanobts class.
Change-Id: Ib0e003f74603c3146aa76d581ab493f960f73ab5

modem: get IMSI from ofono
There's no need to specify the IMSI manually in resource config and it's
also prone to errors. Let's take it from ofono. Add a 'sim' feature to
allow modem to auto-discover it, otherwise if not supported leave that
feature out of the config for that modem and an imsi can still be
manually providen.
Change-Id: I20f9e8d97775293925205e4ea576d814214bf1a8

example: Maintain different resources.conf for RnD and prod
We still want to maintain this file in the same osmo-gsm-tester repo 
because we frequently neef to update the config when adding new 
features.
Until now only 1 file was maintained (which was used for RnD setup), and 
then when runnin in prod the jenkins script used sed to change the file 
to accomodate slightly changes. This way is too hacky, so let's just 
maintain too separate files, keeping the original resources.conf key 
name used by osmo-gsm-tester free, so that jenkins job can symlink one 
of the 2 files to it.
Take the chance to remove OctoBTS and Sysmocell5k from the RnD resources 
file, as we don't have those them.
Change-Id: Ifec851c7ac6fca6b294e57dfe86b92f214ae8f42

modem: workaround ofono crash
Since commit bfd0b2310cf09e32cb7d5dbe74ec57606a7d2aab, the IMSI is 
retreived from ofono. To get the IMSI, the modme must be powered ON 
previously. The imsi() method is called before calling connect() in 
order to set up the IMSI in the HLR. As a result, the following 
behaviour occurs:
- Powered=true (in imsi())
- SimManager.GetProperties() (several of them)
- Powered=false (power_cycle() in connect()
It seems powering off the modem immediately after using the SIM service 
makes ofono crash. Proof of it is that crashes were seen mainly on tests 
using only 1 MS, in which we don't spend that much time between 
SimManager.GetProperties() and Powered=false for the same modem.
Let's workaround the crash for now increasing the time between using the 
SIM services and powering the modem off.
Related: OS#3064
Change-Id: Ief052cac5a862d6ef9391d40c294ba017387506c