[SSSD] [PATCH][DING-LIBS] Fix license text for several files that should be LGPLv3+

[Stephen Gallagher]

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This is NOT a relicensing. These files were mislabeled. They were
always LGPLv3+.

Patch applies to both master and ding_libs-0-1 branches.
- -- 
Stephen Gallagher
RHCE 804006346421761

Delivering value year after year.
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