create_legacy_bootloader_templates.sh: ensure grub escapes quotes
create_legacy_bootloader_templates.sh: ensure grub escapes quotes

Evidently no one has tested the grub.cfg since verified boot landed. Grub eats
double quotes which breaks verified boot. This changes adds the escapes.  No
other code changes should be needed in build and install code since they
replace DMTABLEA and DMTABLEB and not the quotes.

TEST=nsanders escaped the quotes in his build :); I am doing a new build to ensure the output is escaped now.
BUG=chrome-os-partner:1603

Change-Id: I55e823347c91493caf3b5b2e4577a4e4616df7f0

Review URL: http://codereview.chromium.org/4529002

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