check-create-certificate-0.5-bp156.3.1

- updated to official GPL-2.0 text
- updated spec file

- Adapted the License according to the spdx standard
- Cleaned the spec file up

- be less verbose by default, add verbose mode (bnc#600829)
- use secure umask to prevent race conditions
- 0.5

- fix hostname identification (bnc#592217)
- 0.4

- adding license file and license header (bnc#578209)
- 0.3

- fix script name in header comment
- 0.2

- initial checkin of version 0.1 into git repository