ISPN-3712 Add ByteArrayKey to the 5.2.x compatibility layer so that the HotRod target migrator can read keysets
          from 5.2.x servers
ISPN-3714 No need to wrap ClassLoaders in WeakReference in invocationContext implementations
ISPN-3715 SingleKeyNonTxInvocationContext is not using the provided KeyEquivalence
ISPN-3318 Add embedded rolling upgrade documentation

* Command-Line Interface cache loader will be documented in a
separate commit.
ISPN-3400 Update JCache documentation
ISPN-3534 Investigate performance regressions in Infinispan 6.0.0

Set the default UFC.max_credits and MFC.max_credits to 2M, which is also
the JGroups default.
ISPN-3708 Allow setting a default cache for the Protocol servers