test/vhost: Remove norandommap from vhost initiator tests

Removing norandommap as it is not correct to use with
verify-enabled tests

From fio man:
Normally fio will cover every block of the file when doing
random I/O. If this parameter is given, a new offset will be
chosen without looking at past I/O history.
This parameter is mutually exclusive with verify.

Change-Id: I739642461b3dbe9ab8698836aa120bfb14c2b79e
Signed-off-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-on: https://review.gerrithub.io/385431


Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com>
Reviewed-by: Ziye Yang <optimistyzy@gmail.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>