python-smartpm: change "already installed" warnings into info messages
It's possible to trigger "already installed" messages during normal
usage if you explicitly install something in the image through
IMAGE_INSTALL that has a dependency on some -dev packages and also have
dev-pkgs in IMAGE_FEATURES. Since we now check the do_rootfs log for
warnings, these are reported as warnings at the build system level.
This situation should not trigger warnings, nor is it really cause for
concern under any other circumstance if the user asks smart to install
something that's already installed, so make it an info message rather
than a warning.
Fixes [YOCTO #7840].
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
