Improve Fedora build host support.

Sudo command (even using -E) resets $PATH for security reasons, Fedora
and other distos might have to explicitly add /usr/local/bin to $PATH
in order to run the commands in the chroot environment.

Change-Id: I95068ecf1e7437152e11c6d6789f59bcfd6ae9cc
Merge "Improve Fedora build host support."