Do not use sharding rule for table creation check. Also drop them from unit and regress

[reshke]

db1=# create table tt2(id int);
ERROR:  client proccessing error: error processing query 'create table tt2(id int);': create table stmt ignored: no distributions for this relation found, tx status IDLE

[Denchick]

no distributions for this relation found, tx status IDLE

wait, maybe error or something else? Seem like there is no reasons to keep client

[Denchick]

almost all regress tests failed

(using postmaster on regress_router, port 6432)
============== running regression test queries        ==============
test shard_routing                ... FAILED       44 ms
test mixed_routing                ... FAILED       28 ms
test copy_routing                 ... FAILED       15 ms
test joins                        ... FAILED       19 ms
test target_session_attrs         ... FAILED       14 ms
test transactions                 ... ok           17 ms
test with_tables                  ... FAILED       25 ms
test single_shard_joins           ... FAILED       15 ms
test multishard                   ... ok           19 ms
test error                        ... FAILED       20 ms
test begin                        ... FAILED       25 ms
test switch_distribution          ... FAILED       13 ms
test alter_distribution           ... FAILED       26 ms

[EinKrebs]

Obsolete due to #510, consider colsing this PR