codegen: change password to the default

Change-Id: I8a00e93b87fc332afb584729000224636f41f20e
Signed-off-by: Michael pasternak <mpastern@redhat.com>
sdk: allow nullifying headers via passing NULL as header value

Change-Id: I848b909a57345dcbccceaabed06cc946e1c47e57
Signed-off-by: Michael pasternak <mpastern@redhat.com>