[IE CLDNN] Fix device release with static plugin instance (#1034)

[IE CLDNN] Fix device release with static plugin instance (#1034)

The problem was in order of freeing memory. _context was removed before
_device and it looks like cl::Device in destructor tries to read some
info from cl::Context. And in this case we got this problem with
addressing because the memory already was freed.

For fixing the problem I changed the order of constructing members. And
based on principle: "First constructed, last destructed", the problem
was fixed.

JIRA: 29649