install: add -H flag for install

inst* functions and dracut-install now accept the "-H" flag, which
logs all installed files to /lib/dracut/hostonly-files. This is used
to remove those files, if rd.hostonly is given on the kernel command line.
Makefile: add debugtestimage and debughostimage targets
Add rd.hostonly kernel command line parameters

rd.hostonly=0 will remove all configuration compiled in the initramfs
from the host on which it was build
usable_root(): only check for ld-*.so

current systemd allows booting with only /usr on the root partition

see, if we can find an elf loader
print out, what kernel command line parameters are used
TEST-04-FULL-SYSTEMD/test.sh: removed debug comments
kernel-modules: add tegra arm modules
default to hostonly_cmdline=yes, if hostonly

if hostonly_cmdline is not yet set, set it to "yes", if in hostonly
mode.
Add "rd.cmdline=ask" kernel command line parameter

prompts the user for additional kernel command line parameters
resume: only install hostonly files, if in hostonly mode
base/init.sh: use loop counter with unique varname

$i can be polluted too easily
ifcfg: depends on network
test: add udev settle after sfdisk
TEST-15-BTRFSRAID: install /etc/os-release

makes systemd switch-root happy
NEWS: update for version 038