Updated addWebservice WS method to admin UI

Signed-off-by: Pedro Nunes <pgh.nunes@gmail.com>
Verify URL when adding WS

Signed-off-by: Pedro Nunes <pgh.nunes@gmail.com>
Output SSH exception message (not full stacktrace)

Signed-off-by: Pedro Nunes <pgh.nunes@gmail.com>
Output Webservice exception message (not full stacktrace)

Signed-off-by: Pedro Nunes <pgh.nunes@gmail.com>
Minor bugfix; FileUtil check if file exists before attempting to remove
it; better error output

Signed-off-by: Pedro Nunes <pgh.nunes@gmail.com>