Remove duplicate bandwidth test server list

Remove duplicate, outdated bandwidth test server list + some rewording & clarifications.

Author: matzf

content/apps/bwtester.md

@@ -18,19 +18,17 @@ See [Installation](../install/pkg.html#applications) for details.
 
 ## bwtestclient
 
-Sample servers are installed at the following locations:
-
-* `17-ffaa:1:13,[192.168.1.79]:30100`
-* `17-ffaa:1:f,[10.0.2.15]:30100`
-* `19-ffaa:1:22,[141.44.25.146]:30100`
-
-You can test the application as follows:
+You can run the bandwidth test client application as follows:
 
 ```
-scion-bwtestclient -c 17-ffaa:1:89,[127.0.0.1]:0 -s 17-ffaa:1:13,[192.168.1.79]:30100
+scion-bwtestclient -c 17-ffaa:1:89,[127.0.0.1]:0 -s <server-address>
 ```
 
-Here, `-s` specifies the bandwidth server whereas `-c` specifies your machine.
+
+The `-s` flag specifies the bandwidth server.
+Sample servers are installed at the various locations in the SCIONLab network, [see below](#scionlab-bandwidth-test-servers).
+
+The `-c` specifies your local address.
 The `-c` flag can be omitted if a SCION localhost address is configured. To do this, add your
 SCION host to the `/etc/hosts` file. Below you can see an example:
 
@@ -49,7 +47,7 @@ SCION host to the `/etc/hosts` file. Below you can see an example:
 The application supports specification of the test duration (up to 10 seconds), the packet size to be used (at least 4 bytes), the total number of packets that will be sent, and the target bandwidth. For instance, `5,100,10,1600bps` specifies that 10 packets of size 100 bytes will be sent over 5 seconds, resulting in a bandwidth of 1600bps. The question mark `?` character can be used as wildcard for any of these parameters. Its value is then computed according to the other parameters. The parameters for the test in the client-to-server direction are specified with `-cs`, and the server-to-client direction with `-sc`. So for instance to send 1 Mbps for 10 seconds from the client to the server, and 10 Mbps from the server to the client, you can use this command:
 
 ```
-scion-bwtestclient -s 17-ffaa:1:13,[192.168.1.79]:30100 -cs 10,1000,1250,1Mbps -sc 10,1000,12500,10Mbps
+scion-bwtestclient -s <server-address> -cs 10,1000,1250,1Mbps -sc 10,1000,12500,10Mbps
 ```
 For more information run the application without arguments to print its usage.
 
@@ -73,7 +71,7 @@ uses localhost to bind to. In this case, the port can be specified with the `-p`
 scion-bwtestserver -p 30100 &
 ```
 
-## SCIONLab Test Servers
+## SCIONLab Bandwidth Test Servers
 
 There are multiple bandwidth servers deployed inside the SCIONLab infrastructure. Some of them can be reached using the following addresses