Changes

testenv: fix OSMO_DEV_MAKE_DIR env var

When --autoreconf-in-src-copy was made the default, the make dir name
has been changed to make2 but this variable was not adjusted. Fix it.

Fixes: dacbca96 ("testenv: use --autoreconf-in-src-copy by default")
Change-Id: Ia46ebe1240806995960545afbb34e6533580f209

sccp: testenv: fix hardcoded sccp_demo_user path

The current path only worked for with podman and with osmo-dev. Make it
work for the following use cases too:

* without podman, with osmo-dev
* with podman, with binary packages (instead of osmo-dev)

Removing package=no is required, so testenv builds sccp_demo_user from
source when running with --binary-packages. This is needed as
sccp_demo_user is not packaged (OS#5899).

Change-Id: Id6e0b669dcb71cab9e789fe011e60827a8e07f77

sccp: testenv: fix run with asan + latest binaries

When running against osmocom:nightly:asan, build sccp_demo_user with
--enable-sanitize. Otherwise this code is not running with asan and
doesn't even start (as the libraries we link against are built with
--enable-sanitize).

When running against osmocom:latest, check out the latest tag instead of
current master.

Fixes: OS#5899
Change-Id: I5307125560694feae9f0978ebd27607a77ed8675

testenv: remove TESTENV_GIT_DIR

This variable is not used anymore, remove it.

Change-Id: Iabb9fa3b9b393b2cb7f18fb877746e5d1e510e63