Fix links to github PRs under 'Additions' section on release note.
Merge pull request #969 from basho/bugfix/fix-gh-link-on-releasenote

Fix links to github PRs under 'Additions' section on release note.

Reviewed-by: shino
update releasenote.ja for 1.5.1.
Merge pull request #984 from basho/feature/relnote-1.5.1-ja

Update releasenote.ja for 1.5.1.

Reviewed-by: shino
Add script to repair invalid state manifests in the GC bucket
Add test for the script to repair invalid state manifests in the GC bucket
Remove dummy error, oops
Fix bug in repair manifest test under multibag configuration
Merge pull request #983 from basho/feature/repair-invalid-gc-manifests

Add script to repair invalid gc manifests

Reviewed-by: kuenishi
Regression test: pbc-leak in anonymous list objects for a non-existent bucket

cf. https://github.com/basho/riak_cs/issues/985
Fix pbc-leak in anonymous list objects for a non-existent bucket
Regression test: pbc-leak in /riak-cs/users request

cf. https://github.com/basho/riak_cs/issues/985
Fix pbc-leak in /riak-cs/users requests

This also fixes premature pbc checkin to the pool.
See also: https://github.com/basho/riak_cs/commit/60b32b3e06a2959d815a602ebe5e23f7eef4c104
Remove dummy errror
Fix return type mismatch
Change multibag repository reference to master branch
Pin the fix on multibag
Merge release/1.5 to avoid conflict
Merge pull request #986 from basho/bugfix/pbc-pool-leak

Fix PB connection pool (pbc_pool_master) leaks

Reviewed-by: kuenishi
Add logging when recieved {error, disconnected} to diagnose the cause

This commit adds logging the result of `riakc_pb_socket:is_connected/1`
when Riak CS recieved {error, disconnected} from Riak. This forms a
part of long campaign of connection problem between Riak and Riak CS.
`riakc_pb_socket:is_connected/1` returns `{false, []}` mostly when
TCP connection was closed by Riak - or by Operating System. Sometimes
increasing `somaxconn` or `pb_backlog` helps. If the second element
of the return value, the list of reasons when connecting to Riak
(technically, return value of `gen_tcp:connect` might help diagnosing
the root cause, which is usually outside Riak and Riak CS.

Those logging lines are added to major places where disconneced error
was observed. `riakc_pb_socket` could return disconneced at any call,
potentially, but these logging lines will cover most of them.