pgsql: Fix a couple of bugs in recent parallelism-related commits.

Fix a couple of bugs in recent parallelism-related commits.

Commit 816e336f12ecabdc834d4cc31bcf966b2dd323dc added the wrong error
check to async.c; sending restrictions is restricted to the leader,
not altogether unsafe.

Commit 3bd909b220930f21d6e15833a17947be749e7fde added ExecShutdownNode
to traverse the planstate tree and call shutdown functions, but made
a Gather node, the only node that actually has such a function, abort
the tree traversal, which is wrong.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/bde39eed0cafb82bc94c40e95d96b5cf47b6f719

Modified Files
--------------
src/backend/commands/async.c        |    5 +++--
src/backend/executor/execProcnode.c |    5 +----
2 files changed, 4 insertions(+), 6 deletions(-)