Cleanup of file permissions

Mostly removed execute on non-executable files

Change-Id: Ibfbe7e0cf0fbeabef602d70b20f75e1dd3bdf9c9
timing-based affinity sorting for primary replicas

This changes the way primary replicas can be sorted on GET requests.
Previously, replicas were shuffled. Now, if configured, the replicas
are sorted based on the most recent connection time data to that node.
This patch adds a config value that changes the sorting method.

get_more_nodes() (ie handoffs) is unaffected by this patch because
sorting by affinity would break the durability provided by the current
as-unique-as-possible handoff selection.

Timing data is collected for each node each time the proxy makes a
connection to that node (IP address). If timing data for a node doesn't
exist, then it is assumed at -1 (ie will sort earlier) so that timing
data can be collected for that node.

Change-Id: I837fa21c3a566b10cce33eb75788665e1d01cd8a