io-threads: Support autoscaling volfile options

This commit finally makes the autoscaling feature visible to the user.
Know that we're now using two separate thread-pools, one for data
requests, called ordered thread-pool in io-threads, and the other
for meta-data requests, called un-ordered thread-pool.
We do not expose this information to the user to keep io-threads
simple. Consequently, when the user specifies a min-threads and
max-threads value, the number of threads assigned to each pool
is equal, i.e. both pools start with their min threads set to half of
the option "min-threads" and both scale up their threads at most up to
half of option "max-threads".

Volfile options will be added to the wiki and user-guide.

Signed-off-by: Anand V. Avati <avati@amp.gluster.com>

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