util: vet fix

Fix the following vet report:

util/log.go:120: arg err.Error for printf verb %s of wrong type: func() string
wmf: vet fixes

Fix the following vet reports:

wmf/handlers_test.go:43: missing argument for Errorf(%s): format reads arg 2, have only 1 args
wmf/handlers_test.go:277: possible formatting directive in Error call
wmf/handlers_test.go:286: missing argument for Errorf(%s): format reads arg 1, have only 0 args
wmf/handlers_test.go:308: possible formatting directive in Error call
wmf/handlers_test.go:364: possible formatting directive in Error call
wmf/handlers_test.go:392: possible formatting directive in Error call
wmf/handlers_test.go:433: possible formatting directive in Error call
wmf/handlers_test.go:439: possible formatting directive in Error call
wmf/handlers_test.go:447: possible formatting directive in Error call
wmf/handlers_test.go:485: missing argument for Errorf(%s): format reads arg 1, have only 0 args
wmf/handlers_test.go:494: possible formatting directive in Error call
wmf/handlers_test.go:549: arg err.Error for printf verb %s of wrong type: func() string
wmf/handlers_test.go:553: arg err.Error for printf verb %s of wrong type: func() string
wmf: vet fixes

Fix the following vet reports:

wmf/hawk_test.go:56: possible formatting directive in Error call
wmf/hawk_test.go:67: possible formatting directive in Error call
wmf: vet fixes

Fix the following vet reports:

wmf/utils_test.go:106: possible formatting directive in Error call
wmf/utils_test.go:110: possible formatting directive in Error call
wmf/utils_test.go:114: possible formatting directive in Error call
wmf/utils_test.go:118: possible formatting directive in Error call
wmf/storage: vet fixes

Fix the following vet reports:

wmf/storage/pg.go:533: arg state for printf verb %b of wrong type: bool
wmf/storage/rcs.go:234: missing argument for Printf(%+v): format reads arg 3, have only 2 args
Merge pull request #320 from ceh/vet-fixes

vet fixes