Place filter tokens in script sources.

srv/scripts/gvm

@@ -1,5 +1,5 @@
 #!/bin/bash
-GVM_VERSION="0.8.2"
+GVM_VERSION="@GVM_VERSION@"
 PLATFORM=$(uname)
 
 #

srv/scripts/gvm-init.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-export GVM_SERVICE="http://get.gvmtool.net"
+export GVM_SERVICE="@GVM_SERVICE@"
 
 PATH="$HOME/.gvm/bin:$PATH"
 

srv/scripts/install.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-GVM_SERVICE="http://localhost:8080"
+GVM_SERVICE="@GVM_SERVICE@"
 PLATFORM=$(uname)
 
 echo '                                                                     '