aa-easyprof prints to stdout upon manifest parsing errors

When generating profiles with aa-easyprof from a manifest file, the default behavior is to print the resulting profile to stdout. Therefore, it is common to pipe aa-easyprof's stdout to a file. However, when the manifest has an issue that causes parsing to fail, the error message is printed to stdout instead of stderr.

Current behavior:

$ ./utils/aa-easyprof -m /dev/null 1> /dev/null
$ ./utils/aa-easyprof -m /dev/null 2> /dev/null

Could not parse manifest

Expected behavior:

$ ./utils/aa-easyprof -m /dev/null 1> /dev/null
ERROR: Could not parse manifest
$ ./utils/aa-easyprof -m /dev/null 2> /dev/null