Provide smaps in pt-stalk

Registered by Daniel Nichter on 2013-03-13

From https://bugs.launchpad.net/percona-toolkit/+bug/1146656:

Currently pt-stalk uses pmap/pmap -x to provide process map.
Even though that is useful and good, more can be provided here
which can help better.

One way is to read /proc/$pidof/smaps, newer pmap provides a -X
option but that is not yet in CentOS 6.3 (may be there in 6.4).

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