rgw/lc: remove default arguments in virtual functions

rgw/lc: remove default arguments in virtual functions

Signed-off-by: Juan Zhu <jzhu4@dev-10-34-20-139.pw1.bcc.bloomberg.com>
(cherry picked from commit a15b7d1cc5197f778d2fe0f4a8c2fb2be6cd9435)

Conflicts:
	src/rgw/driver/d4n/rgw_sal_d4n.cc
	src/rgw/driver/d4n/rgw_sal_d4n.h
	src/rgw/driver/posix/rgw_sal_posix.h
	src/rgw/driver/rados/rgw_sal_rados.cc
	src/rgw/driver/rados/rgw_sal_rados.h
	src/rgw/rgw_file.cc
	src/rgw/rgw_op.cc
	src/rgw/rgw_sal.h
	src/rgw/rgw_sal_daos.h
	src/rgw/rgw_sal_dbstore.h
	src/rgw/rgw_sal_filter.cc
	src/rgw/rgw_sal_filter.h
	src/rgw/rgw_sal_motr.h
	src/test/rgw/test_d4n_filter.cc