Add bash completion for flags for some build scripts. For example, ./build_packages --<tab> will try to complete all supported ./build_packages flags (or print them if completion is non-unique). This completion could be used outside chroot.
Add bash completion for flags for some build scripts.
For example, ./build_packages --<tab> will try to complete all supported
./build_packages flags (or print them if completion is non-unique).
This completion could be used outside chroot.

Review URL: http://codereview.chromium.org/661096

sigma/coreos-scripts,zhang0137/scripts,BugRoger/scripts,trnubo/scripts,glevand/coreos--scripts,crawford/scripts,trnubo/scripts,nicescale/scripts,fivethreeo/scripts,nicescale/scripts,andrejro/coreos--scripts,BugRoger/scripts,vmware/coreos-scripts,bcwaldon/coreos-scripts,smilart/scripts,sigma/coreos-scripts,endocode/scripts,mjg59/scripts,bcwaldon/coreos-scripts,mjg59/scripts,glevand/coreos--scripts,nicescale/scripts,endocode/scripts,zhang0137/scripts,BugRoger/scripts,coreos/scripts,mischief/scripts,crawford/scripts,marineam/coreos-scripts,sigma/coreos-scripts,trnubo/scripts,vmware/coreos-scripts,fivethreeo/scripts,smilart/scripts,andrejro/coreos--scripts,mischief/scripts,andrejro/coreos--scripts,fivethreeo/scripts,gtank/scripts,mjg59/scripts,mischief/scripts,crawford/scripts,gtank/scripts,coreos/scripts,gtank/scripts,marineam/coreos-scripts,zhang0137/scripts,smilart/scripts,bcwaldon/coreos-scripts,endocode/scripts,marineam/coreos-scripts,vmware/coreos-scripts