fix TCH/H for TC_chan_exhaustion

At the moment we use onle TCH/F and PDCH in our osmo-bsc config,
but the tests TC_assignment_codec_amr_h and TC_assignment_codec_h
requre a half rate channel in order to work. Configuring one TCH/F
to TCH/H seems not to hurt any tests except TC_chan_exhaustion

- also regard half rate channels in TC_chan_exhaustion
- change included sample osmo-bsc.cfg

Change-Id: Idd5a9602f1b49b5aa0fc510faa151fe16c0b404d
Related: OS#3100
diff --git a/bsc/osmo-bsc.cfg b/bsc/osmo-bsc.cfg
index 2fa67e9..60cfcd7 100644
--- a/bsc/osmo-bsc.cfg
+++ b/bsc/osmo-bsc.cfg
@@ -149,7 +149,7 @@
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 5
-    phys_chan_config TCH/F
+    phys_chan_config TCH/H
     hopping enabled 0
    timeslot 6
     phys_chan_config PDCH
@@ -239,7 +239,7 @@
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 5
-    phys_chan_config TCH/F
+    phys_chan_config TCH/H
     hopping enabled 0
    timeslot 6
     phys_chan_config PDCH
@@ -329,7 +329,7 @@
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 5
-    phys_chan_config TCH/F
+    phys_chan_config TCH/H
     hopping enabled 0
    timeslot 6
     phys_chan_config PDCH