Make read-repair stats be 'proplist' instead of 'value'

'value' is actually something that should practically never be
used in exometer function metrics. In this case, it causes the
return value to be wrong if the exometer:aggregate() function doesn't
find any detailed stats to aggregate.
Set schema dirs for riak_core in riak_kv_test_util
Merge pull request #1068 from basho/bugfix/clique-schema-issues

Set schema dirs for riak_core in riak_kv_test_util

Reviewed-by: jburwell
Merge pull request #1067 from basho/uw-fix-read-repair-stats

Make read-repair stats be 'proplist' instead of 'value'

Reviewed-by: jburwell
WIP move vnode persistent state into new module/process
WIP kv679 fixes. Adds a per vnode monotonic counter

use the counter to create a per epoch key when local not found.
WIP: don't allow the counter to get above 32bit int size

When it hits that limit create a new vnodeid.
WIP fix xref errors
WIP fix dialyzer
WIP really fix dialyzer
WIP only increment vnode counter on new per key epoch

Start a new epoch if the local object has a lower epoch for the
vnode id than the incoming object (no epoch is lower, no epich is zero)
WIP fix new dialyzer errors

Bad match for re-refactord put_merge return.
Correct return type for highest_actor
WIP update the vnode status command as per fix on 2.0 branch
Don't force a new epoch on old keys

use the bare vnodeid as long as possible, only start a new epoch
when needed. In a way the bare vnodeid is just epoch zero, so use it.

Also, consider the incoming counter when deciding about new epochs.
An incoming clock with the same actor+epoch but greater counter is
a hint that a byzantine failure occurred and a new epoch is needed
Fix some doco/spec errors, fix an error getting the timeout for leases
Shhhh, loud test.
Add some docs and specs and fix the transposed args that dialyzer found

NOTE: make dialyzer exits with an error, but no information. Could
do with some help on that.
fix filename spec typo
Add a `status` command for testing purposes
WIP for help on test