Copy usage from full_install_osm into install_osm

Change-Id: I3551d6e5021ffbc64a6a17a5f17251f838c07a33
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/full_install_osm.sh b/installers/full_install_osm.sh
index 970bccc..8dbc151 100755
--- a/installers/full_install_osm.sh
+++ b/installers/full_install_osm.sh
@@ -16,7 +16,7 @@
 function usage(){
     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
     echo -e "usage: $0 [OPTIONS]"
-    echo -e "Install OSM from binaries or source code (by default, from binaries)"
+    echo -e "Install OSM"
     echo -e "  OPTIONS"
     echo -e "     -h / --help:    print this help"
     echo -e "     -y:             do not prompt for confirmation, assumes yes"