Validate number of steps specified in permutation

A permutation that specifies more steps than defined causes
isolationtester to crash, so avoid that.  Using less steps than defined
should probably not be a problem, but no spec currently does that.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/50363c8f86f89fe611ba417575218978917f1ac0

Modified Files
--------------
src/test/isolation/isolationtester.c |    9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)

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