IB extension: segfault in create collective group with non-vector type IA handle"

IB extension: segfault in create collective group with non-vector type IA handle"

The dats_get_ia_handle call was change in 2.0.34 to convert IA handle from
both vector to handle and handle to vector to fix query calls that
incorrectly returned IA handles in non-vector form. If a caller uses a
non vector IA handle it will get converted incorrectly to a vector and cause
a segfault. Add additional check to verify a IA handle type before calling
get ia handle to avoid incorrect translation.

Signed-off-by: Arlin Davis <arlin.r.davis@intel.com>