Installing Python to a ramdisk takes quite a long time because of
the way dracut checks for dependencies of every single file
installed. We could avoid that, but then we might miss a required
library file.
This change alters the installation method to speed up
the process. First, it creates a list of files that are needed and
then installs them all at once using inst_multiple instead of calling
inst on each file separately. This doesn't make a huge difference,
but in my testing it is marginally faster.
Second, and more significantly, we don't need the *.pyo and *.pyc
files as those are simply an optimization to speed up module
loading. Because the deploy ramdisk is a short-lived operation,
we probably lose more time transferring those extra files to the
target system than we save in improved load times.
In my testing, these two changes netted about a 20% improvement
in build times, and about 13% decrease in image size.
Change-Id: Ibc2b778c28fc9fb7177380dffe8dbce5722d0733
3f3cded06b