test/connector_c: test for single-field tuple iteration
test/connector_c: test for single-field tuple iteration

nvoron23/tarantool,Sannis/tarantool,vasilenkomike/tarantool,guard163/tarantool,dkorolev/tarantool,nvoron23/tarantool,condor-the-bird/tarantool,guard163/tarantool,ocelot-inc/tarantool,guard163/tarantool,rtsisyk/tarantool,dkorolev/tarantool,rtsisyk/tarantool,nvoron23/tarantool,nvoron23/tarantool,vasilenkomike/tarantool,vasilenkomike/tarantool,Sannis/tarantool,guard163/tarantool,condor-the-bird/tarantool,guard163/tarantool,Sannis/tarantool,mejedi/tarantool,dkorolev/tarantool,KlonD90/tarantool,ocelot-inc/tarantool,Sannis/tarantool,KlonD90/tarantool,rtsisyk/tarantool,Sannis/tarantool,mejedi/tarantool,condor-the-bird/tarantool,ocelot-inc/tarantool,mejedi/tarantool,KlonD90/tarantool,mejedi/tarantool,condor-the-bird/tarantool,vasilenkomike/tarantool,vasilenkomike/tarantool,dkorolev/tarantool,rtsisyk/tarantool,nvoron23/tarantool,KlonD90/tarantool,dkorolev/tarantool,ocelot-inc/tarantool,nvoron23/tarantool,condor-the-bird/tarantool,KlonD90/tarantool