We were using different methods and violating the correctness error
"Log tags are only allowed to be at most 23 tag characters long." as reported
by lint.
Changes:
* Always start tags by "fdroid." (even though it's a bit redundant)
* Replace "org.fdroid.fdroid." by "fdroid."
* Don't include "compat.", "data." "views.fragments." et al (these didn't and
shouldn't be namespaces really, only for file/code organisation)
* Do include parent classes for subclasses, e.g. "fdroid.RepoProvider.Helper"
since these can conflict