Replaced hardcoded password with KeyStoreManager constant

Signed-off-by: Dominik Schadow <dominikschadow@googlemail.com>
Removed System.out.println statements

Signed-off-by: Dominik Schadow <dominikschadow@googlemail.com>
Removed all printStackTrace() calls

Signed-off-by: Dominik Schadow <dominikschadow@googlemail.com>
Removed main method

Signed-off-by: Dominik Schadow <dominikschadow@googlemail.com>