Rename OpenGGSN to OsmoGGSN

Osmocom has maintained this program since about 7 years now, while
the original author / copyright holder has completely disappeared.

With the introduction of Osmocom-style CTRL and VTY interfaces,
the way how the program is used and configured has substantially
changed.  In order to avoid confusion in terms of configuration file
format etc, let's rename it to OsmoGGSN.

Change-Id: I2da30f7d4828e185bfac1a4e2d8414b01cbe4f9d
diff --git a/doc/Compliance.html b/doc/Compliance.html
index f33bc6f..4c2fc3a 100644
--- a/doc/Compliance.html
+++ b/doc/Compliance.html
@@ -7,7 +7,7 @@
 </head>
 <body>
 <h1>Protocol Compliance List</h1>
-OpenGGSN supports both GTP0 (GSM 09.60) and GTP1 (3GPP 29.060). In the
+OsmoGGSN supports both GTP0 (GSM 09.60) and GTP1 (3GPP 29.060). In the
 following tables the support of each individual message type is
 detailed. The numbers before each feature indicates the relevant
 section in the standard.<br>