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Introduce struct cmd_vg to store information about needed
volume group name, vgid, flags and the pointer to opened VG.
Keep VGs list in alphabetical order for locking order.
Introduce functions:
cmd_vg_add() add new cmd_vg entry.
cmd_vg_lookup() search cmd_vgs for vg_name.
cmd_vg_read() open VGs in cmd_vgs list.
cmd_vg_release() close VGs in reversed order.