pgsql: In isolationtester, retry after EINTR return from select(2).

In isolationtester, retry after EINTR return from select(2).

Per report from Jaime Casanova. Very curious that no one else has seen
this failure ... but the code is clearly wrong as-is.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/faf4726c9fd5748ad25dbce55a7d31deeabe9866

Modified Files
--------------
src/test/isolation/isolationtester.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

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