test: fixup unit-test naming

Fixup naming convention for unit-test files and add to gitignore.

Change-Id: I0fe5d167e52c4a05d1c89dfd996afdde4b48a4c9
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index 0e8d05d..c13c7cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -40,6 +40,10 @@
 ltmain.sh
 missing
 test-driver
+*_unittest
+*_unittest.log
+*_unittest.trs
+test-suite.log
 
 # Custom generated files