ima-evm-utils: Add some tests for evmctl

This series adds simple evmctl tests for hash, sign, and verify operations. Diff of v10 from v9: https://github.com/vt-alt/ima-evm-utils/compare/tests-v9..tests-v10

---
Changelog since v9:
- Add more quotes to colors and return values to quiet shellcheck.
- Expand comments about keyid handling as suggested by Mimi Zohar, also, make keyid handling move explicit.
- Quiet shellcheck false positives.

Changelog since v8:
- Small corrections (like adding double quotes) to satisfy shellcheck.
- Rename coloring helper functions.
- Always define VERBOSE. -- All above by Mimi Zohar request.
- Spelling correction by Lakshmi Ramasubramanian.

Changelog since v7:
- Absence of key file cause test skip instead of fail.
- Mono patch is split into two by Mimi Zohar request.

Changelog since v6:
- ima_hash.test: Compare generated hashes with known values.
I found that on power8 qemu with default -cpu calculates hashes wrongly. For exmaple: `openssl dgst -sha224 -hex /dev/null' results in 83b2514951547ee00c7062fa3eb42079ff19f280ec81eedbdb0e3997 instead of d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f.
- Make _keyid' use temporary files to not rely on presence of /des/stdout'.
- evm sign: add `--generation 0' option.
I found that on overlay fs (with ext4 over 9p) FS_IOC_GETVERSION does not work.
- gen-keys.sh: allows `force' argument to regenerate all test keys.

Changelog since v5:
- Fix tests if gost-engine is not present. Thx to Mimi Zohar for testing on Xenial.

Changelog since v4:
- Fix bugs found by Mimi Zohar:
- Fix typos in variable names
- Fix `-out -' in asn1parse for openssl 1.0.x

Changelog since v3:
- Apply changes based on some suggestions from Petr Vorel, such as
- Add .gitignore
- Do not color output if stdout is not tty.
- Fix blkid error with --uuid option.
- Remove or change some comments
- Replace ENGINE with EVMCTL_ENGINE and OPENSSL_ENGINE.
- All tests pass over next branch.

Changelog since v2:
- ima_sign.test and ima_verify.test merged into sign_verify.test which is also able to test evm signatures.
- Apply Mimi Zohar suggestions regarding commenting, variable renaming, code rearranging, etc. with intent to simplify the code and review.

Changelog since v1:
- Apply suggestions by Petr Vorel:
- Rename function names and variables to be more understandable.
- Rename tests/functions to tests/functions.sh.
- Define exit codes (77, 99, ...) as variables.
- Added more comments and remove single letter variables (for Mimi Zohar).
- Move getfattr check into function.
- Move evmctl run and check into single function.
- Add sign/verify tests for v1 signatures.
- Minor improvements.
- Since I still edit all 5 files I did not split the patch into multiple commits to separate the files, otherwise editing will become too complicated, as I ought to continuously rebase and edit different commits. This was really non-productive suggestion.

Vitaly Chikunov (2):
ima-evm-utils: Add some tests for evmctl
ima-evm-utils: Add sign/verify tests for evmctl

 .gitignore             |   2 +-
 Makefile.am            |   2 +-
 configure.ac           |   1 +
 tests/.gitignore       |  16 +++
 tests/Makefile.am      |  12 ++
 tests/functions.sh     | 274 ++++++++++++++++++++++++++++++++++++
 tests/gen-keys.sh      |  97 +++++++++++++
 tests/ima_hash.test    |  80 +++++++++++
 tests/sign_verify.test | 370 +++++++++++++++++++++++++++++++++++++++++++++++++
 9 files changed, 852 insertions(+), 2 deletions(-)
 create mode 100644 tests/.gitignore
 create mode 100644 tests/Makefile.am
 create mode 100755 tests/functions.sh
 create mode 100755 tests/gen-keys.sh
 create mode 100755 tests/ima_hash.test
 create mode 100755 tests/sign_verify.test

2.11.0