readme: add some ssh details

Change-Id: Idb5d254768b52300d99b5a1f11f92e8536aec371

doc/README-sysmobts.txt

@@ -34,6 +34,10 @@ SSH ACCESS
 Copy the SSH public key from the system/user that runs the tester to the BTS
 authorized keys file so the tester will be able to deploy binaries.
 
+  scp my_key.pub $sysmobts:
+  ssh $sysmobts
+  cat my_key.pub >> ~/.ssh/authorized_keys
+
 It is also advisable to configure the eth0 network interface of the BTS to a
 static IP address instead of using DHCP. To do so adjust /etc/network/interfaces
 and change the line

doc/README.txt

@@ -95,6 +95,17 @@ possibly other) hardware: place the main unit's public SSH key on the sysmoBTS.
 Log in via SSH at least once to accept the BTS' host key.
 
 
+Jenkins Configuration
+
+(TODO: jenkins build slave details)
+
+When adding an entry to jenkins' known_hosts file, be aware that you need to
+add an actual RSA host key. Using 'ssh' to access the main unit may work, but
+jenkins will still fail to access it in the absence of a full RSA host key:
+
+  ssh-keyscan -H $my_main_unit_ip_addr >> ~jenkins/.ssh/known_hosts
+
+
 LAUNCHING A TEST RUN
 
 osmo-gsm-tester watches /var/tmp/osmo-gsm-tester for instructions to launch