Rename the "experimental" checker package to "alpha".  We will then refine
this group into "alpha" and "beta" to distinguish between checkers in
different levels of premature state.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162582 91177308-0d34-0410-b5e6-96231b3b80d8
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