autotest: Use rpc_cmd() for rpc plugin-based tests

Also, create a common dir which will hold symlinks to all existing
plugins used in the tests. Location of the actual lib is not changed
so the rela

autotest: Use rpc_cmd() for rpc plugin-based tests

Also, create a common dir which will hold symlinks to all existing
plugins used in the tests. Location of the actual lib is not changed
so the relation to the given test suite is clearly preserved.

Signed-off-by: Michal Berger <michalx.berger@intel.com>
Change-Id: Icb70bbc61fbfa3325a357d5dd93f554ff132a3b9
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7146
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

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