[SUITEDEV-2114] fix IDE warnings: rename method
[SUITEDEV-2114] fix IDE warnings: unused params
[SUITEDEV-2114] fix IDE warnings: unresolved ruby references
[SUITEDEV-2114] update .gitignore
[SUITEDEV-2114] fix IDE warnings: .each instead of for loop
[SUITEDEV-2114] fix IDE warnings: unused variables, obsolete todo item, %w
[SUITEDEV-2114] fix IDE warnings: obsolete todo item, etc
[SUITEDEV-2114] fix IDE warnings in tests
[SUITEDEV-2114] distinguish algo_prefix from vendor_key
[SUITEDEV-2114] remove hardcoded amazon credential_scope; it is always specific (just like a username)
[SUITEDEV-2114] move method
[SUITEDEV-2114] loosen expectation
[SUITEDEV-2114] use key_db for presigned URL validation
[SUITEDEV-2114] handle algorithm, make validate methods more uniform