Changes

ipa: Use pseudo-random number for SLS in TCP-client too

Previous commit (see below) replaced the SLS generation from using
the LSB of the file descriptor to a pseudo-random SLS since the former
didn't really achieve enough entropy in real world use cases.

However, that commit only applied it for TCP-server conns, but forgot to
update TCP-client ones.
Present commit fixes that missing part. asp->asp_id is already being set
using a pseudo-randome number in xua_cli_connect_cb().

Fixes: 2c9ba16c2c0210a189c72064eafad5ef336254cd
Related: SYS#6543
Related: SYS#6802
Change-Id: I837505868b608ac5ed658a7e98bb3eeebe3e852c