Add a DIB_APT_MINIMAL_CREATE_INTERFACES boolean to the debootstrap
element which functions identically to
DIB_YUM_MINIMAL_CREATE_INTERFACES in the yum-minimal element.
This can be used to disable the creation of the
/etc/network/interfaces.d/eth[01] dhcp configuration files, which
are not needed on systems where cloud-init or other means are used
to configure networking.
The flag is enabled by default to keep creating the dhcp interface
files, maintaining backwards compatibility.
Change-Id: I1fdaca8350a5ceefd9e437af4fd000ce6a3ee7f3
8756cbea1b