update test_linalg.py for pytest
update test_linalg.py for pytest

vlukes/sfepy,rc/sfepy,sfepy/sfepy,sfepy/sfepy,vlukes/sfepy,BubuLK/sfepy,BubuLK/sfepy,BubuLK/sfepy,rc/sfepy,sfepy/sfepy,rc/sfepy,vlukes/sfepy