Try to avoid requesting a PIN just to load a cert

[simo5]

Description

In many tokens certificates can be loaded without logging into the token,
If the URI unequivocally refrences a certificate object, try to load it without forsing a login.

Fixes #508

Checklist

• Code modified for feature
• Test suite updated with functionality tests
• Test suite updated with negative tests
• Documentation updated

Reviewer's checklist:

• Any issues marked for closing are addressed
• There is a test suite reasonably covering new functionality or modifications
• This feature/change has adequate documentation added
• Code conform to coding style that today cannot yet be enforced via the check style test
• Commits have short titles and sensible commit messages
• Coverity Scan has run if needed (code PR) and no new defects were found

[simo5]

@embetrix any chance you can test if this code change allows your code to work w/o having to set what the store expects?

[Jakuje]

lgtm. Macos is slow so it timed out in the uri test. Tracked in separate issue.