use osmo_init_logging2() with proper talloc ctx

Since the logging allocations now also show up in the root context report, some
tests need adjusted talloc checks.

In msc_vlr_tests, also output the number of talloc blocks before tests are
started to show that the number didn't change after the tests.

Change-Id: Iae07ae60230c7bab28e52b5df97fa3844778158e
diff --git a/tests/msc_vlr/msc_vlr_test_rest.err b/tests/msc_vlr/msc_vlr_test_rest.err
index 73a3692..274f4b8 100644
--- a/tests/msc_vlr/msc_vlr_test_rest.err
+++ b/tests/msc_vlr/msc_vlr_test_rest.err
@@ -1,3 +1,6 @@
+full talloc report on 'msgb' (total      0 bytes in   1 blocks)
+talloc_total_blocks(tall_bsc_ctx) == 12
+
 ===== test_early_stage
 - NULL conn
 msc_subscr_conn_is_accepted() == false
@@ -40,7 +43,7 @@
 ===== test_early_stage: SUCCESS
 
 full talloc report on 'msgb' (total      0 bytes in   1 blocks)
-talloc_total_blocks(tall_bsc_ctx) == 7
+talloc_total_blocks(tall_bsc_ctx) == 12
 
 ===== test_cm_service_without_lu
 - CM Service Request without a prior Location Updating
@@ -83,7 +86,7 @@
 ===== test_cm_service_without_lu: SUCCESS
 
 full talloc report on 'msgb' (total      0 bytes in   1 blocks)
-talloc_total_blocks(tall_bsc_ctx) == 7
+talloc_total_blocks(tall_bsc_ctx) == 12
 
 ===== test_two_lu
 - Location Update request causes a GSUP LU request to HLR
@@ -340,7 +343,7 @@
 ===== test_two_lu: SUCCESS
 
 full talloc report on 'msgb' (total      0 bytes in   1 blocks)
-talloc_total_blocks(tall_bsc_ctx) == 7
+talloc_total_blocks(tall_bsc_ctx) == 12
 
 ===== test_lu_unknown_tmsi
 - Location Update request with unknown TMSI sends ID Request for IMSI
@@ -489,8 +492,8 @@
 ===== test_lu_unknown_tmsi: SUCCESS
 
 full talloc report on 'msgb' (total      0 bytes in   1 blocks)
-talloc_total_blocks(tall_bsc_ctx) == 7
+talloc_total_blocks(tall_bsc_ctx) == 12
 
 full talloc report on 'msgb' (total      0 bytes in   1 blocks)
-talloc_total_blocks(tall_bsc_ctx) == 7
+talloc_total_blocks(tall_bsc_ctx) == 12