crimson/osd: Generalize loading obc for head/clone

[Matan-B]

• load_head_obc is changed to load_obc and can be used to load clone obc's as well.
• get_or_load_obc is introduced and used both by with_head/clone_obc avoiding boilerplates.

(This change will also be useful for CEPH_OSD_OP_ROLLBACK implementation).

Signed-off-by: Matan Breizman [email protected]

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