OsmoGSMTester: add rtprio conf, tweak core dump conf

Change-Id: I284c3bfb15e914f1f6ab00f15874fe5ea6190c5c
diff --git a/doc/manuals/chapters/install.adoc b/doc/manuals/chapters/install.adoc
index 2a20ebd..8ace16f 100644
--- a/doc/manuals/chapters/install.adoc
+++ b/doc/manuals/chapters/install.adoc
@@ -325,9 +325,24 @@
 osmo-gsm-tester source tree to the main unit:
 
 ----
-cp install/osmo-gsm-tester-limits.conf /etc/security/limits.d/
+sudo -s
+echo "@osmo-gsm-tester - core unlimited" > /etc/security/limits.d/osmo-gsm-tester_allow-core.conf
 ----
 
+Re-login the user to make these changes take effect.
+
+==== Allow Realtime Priority
+
+Certain binaries should be run with real-time priority, like 'osmo-bts-trx'.
+Add this permission on the main unit:
+
+----
+sudo -s
+echo "@osmo-gsm-tester - rtprio 99" > /etc/security/limits.d/osmo-gsm-tester_allow-rtprio.conf
+----
+
+Re-login the user to make these changes take effect.
+
 ==== User Permissions
 
 On the main unit, create a group for all users that should be allowed to use