BUG 3067: Added support for blocking if schema is not available.

Codecs are able to send specific exception, which describes
reason of failure for codec failing. If the reason is
missing schema (not yet loaded) we catch it and retry
serialization after schema context is upgraded.

User thread will be blocked maximally for 5 seconds
after that it will be unblocked.

Change-Id: I3494702eae644b495211a1a34c074e268c2f5f46
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>
(cherry picked from commit 6aba3ef282f86a84920fa5a7ccf21c91d459806b)