Fixing tests. test_issue_981.py is now running all 6 commands. The output Key has correctly changed. The type and value are wrong.
```bash
730 rmills@rmillsmm-local:~/gnu/github/exiv2/update_canon_tags_2/build $ env DYLD_LIBRARY_PATH=$PWD/lib bin/exiv2 -g InfoSize ../test/data/*981*a.exv
Exif.CanonAf2Id.AFInfoSize SLong 1 131168
731 rmills@rmillsmm-local:~/gnu/github/exiv2/update_canon_tags_2/build $ exiv2 -g InfoSize ../test/data/*981*a.exv
Exif.Canon.AFInfoSize SShort 1 96
732 rmills@rmillsmm-local:~/gnu/github/exiv2/update_canon_tags_2/build $
```
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