Docs: Update the version of ganeti-instance-debootstrap
Docs: Update the version of ganeti-instance-debootstrap

The installation manual used version 0.12, which had some bugs.
This patch updates it to the latest 0.14.

Signed-off-by: Petr Pudlak <9d19625f8ee825a2c398462ed335cbcf98f79c32@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

yiannist/ganeti,apyrgio/ganeti,dimara/ganeti,apyrgio/ganeti,apyrgio/snf-ganeti,andir/ganeti,mbakke/ganeti,onponomarev/ganeti,leshchevds/ganeti,andir/ganeti,leshchevds/ganeti,grnet/snf-ganeti,yiannist/ganeti,onponomarev/ganeti,bitemyapp/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,leshchevds/ganeti,andir/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,ganeti/ganeti,apyrgio/snf-ganeti,dimara/ganeti,bitemyapp/ganeti,grnet/snf-ganeti,ganeti/ganeti,ganeti/ganeti,yiannist/ganeti