Fixed bug in u_arraylist_contains caused by poor member naming.

Fixed bug in u_arraylist_contains caused by poor member naming.

Corrected a bug in u_arraylist_contains caused by the member names
'size' and 'length' being too similar and hiding a logic problem.
Fixed by changing 'size' to the more common 'capacity'.

The base fix (without any of the name change) was pulled from
Vimala's revision 10 submission of change 2301.
https://gerrit.iotivity.org/gerrit/#/c/2301/10/

Change-Id: I22ac6fc159669ad58212b145f70cb559187fa999
Signed-off-by: Jon A. Cruz <jonc@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2339
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Vimala Vishwanathan <vimala.v@samsung.com>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>