ostadmin: Change command line for qemu deploy helper

ostadmin: Change command line for qemu deploy helper

The qemu helper really wants to copy kernel modules, but not
update the system bootloader.  Allow it to reuse ostadmin for
this.

Note that our previous path of shelling out to "cp -al" broke because
it refused to make cross-device links.

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   src/libotutil/ot-gio-utils.c
#	modified:   src/libotutil/ot-gio-utils.h
#	modified:   src/ostadmin/ot-admin-builtin-deploy.c
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	embedded-dependencies/glib/
#	embedded-dependencies/libsoup/