gh-136: move any fiber yield out of catch block.
gh-136: move any fiber yield out of catch block.

This is done to avoid situation, when two or more
fibers yield inside their try/catch blocks and
throws an exceptions. Seems like exception unwinder
stores some global state while being inside
a catch block.

This could lead to incorrect exception processing
and server crash.

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