Add unique fields for servo to wr_servo_state_t which is placed in shmem.
structure cur_servo_state to be removed soon.
Increment ppsi shmem version.
Part of a process to move wrs-servo internal data into shmem.

remove unused fields from wr_servo_state_t:
-TimeInternal prev_t4;
-TimeInternal nsec_offset;
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>