ub: uburma add cmd import/unimport jetty implementation.

driver inclusion
category: feature
bugzilla: NA
CVE: NA

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Uburma add implementations of handling import/unimport jetty cmd from
user layer.

This will make kernel possible to handle urma_import_jetty and
urma_unimport_jetty api in user-layer urma.

Import_jetty will finally call ubcore_import_jetty. The created target
jetty (tjetty) will be related to a uobj.
Unimport_jetty will delete the tjetty-related uobj.
In uobj destroy function, it will call ubcore_unimport_jetty.

Signed-off-by: Guoxin Qian <qianguoxin@huawei.com>
Signed-off-by: Yizhen Fan <fanyizhen@huawei.com>