install_osm.sh: clean deb repos, but do not remove packages

The script install_osm.sh has been updated to:
- clean deb repos
- do not remove all packages
- admit all options in get opt
- capture errors for options expecting an argument

The script full_install_osm.sh has been updated to:
- order the case options in getopts as they appear in the getopts line
- capture errors for options expecting an argument

Change-Id: I53681cfddf4d6668a31646d3bce0c80e750a6d3c
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>