add 'sync' arg to remaining background calls in pyscf/cc/ccsd.py
add 'sync' arg to remaining background calls in pyscf/cc/ccsd.py

gkc1000/pyscf,gkc1000/pyscf,gkc1000/pyscf,sunqm/pyscf,sunqm/pyscf,sunqm/pyscf,sunqm/pyscf,gkc1000/pyscf,gkc1000/pyscf