fix conversion type missing

Conversion type is missing in some places which would cause some
unexcepted error. By using 'grep -rn "%(\w\+)\W"', we could find
all cases of '%(variable_a)' and fix them.

Change-Id: I05cbaac73976c70be8428bf5a2d0017ea7059cb3
Closes-Bug: #1221036
Merge "fix conversion type missing"