{enb,epc,ms}_srs: expose log.all_level parameter

expose paramter to set log level, use warning as default

Change-Id: I4e77e5351399aefef47a309c82b8805e2c6022c5
diff --git a/src/osmo_gsm_tester/templates/srsepc.conf.tmpl b/src/osmo_gsm_tester/templates/srsepc.conf.tmpl
index a792989..f855127 100644
--- a/src/osmo_gsm_tester/templates/srsepc.conf.tmpl
+++ b/src/osmo_gsm_tester/templates/srsepc.conf.tmpl
@@ -93,7 +93,7 @@
 #           to print logs to standard output
 #####################################################################
 [log]
-all_level = info
+all_level = ${epc.log_all_level}
 all_hex_limit = 32
 filename = ${epc.log_filename}