Try harder to acquire class mapping

Try harder to acquire class mapping

We can perform a third try when we failed to load an augmentation
using TCCL by installing the candidate class classloader as the TCCL.

This can help in situations where we are invoked from a context where
the TCCL is not set up to actually see binding classes properly.

JIRA: MDSAL-379
Change-Id: I56d65494cbce32aee0592e3f0799a2bf283e6d17
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit fde5334962bdf4e098af5c869e723e4c4c06c606)