cfme_data.data fixture usage becomes just cfme_data

This was a gredsed[0] after removing the .data from the cfme_data fixture
return. I spot-checked that the new calling format works and made sure
none of the altered py files have SyntaxErrors, but didn't thoroughly test
it.

[0]: `grep -r -l cfme_data\.data | xargs -n 1 sed -i 's/cfme_data\.data/cfme_data/g'`