[tests] Fix tests.xml typos

Signed-off-by: Matti Kosola <matti.kosola@jolla.com>
[memusage] Fix libmemusage path to /usr/lib/libmemusage.so

Signed-off-by: Matti Kosola <matti.kosola@jolla.com>
Merge pull request #1 from mkosola/master

Fix tests and libmemusage path