Fix the TESTCPU script and .gitignore for the new world

goanwyhere is really nice, use that.

Signed-off-by: Ronald G Minnich <rminnich@gmail.com>

.gitignore

@@ -28,3 +28,5 @@
 *tar
 *uck
 *.pub
+
+u-root/

TESTCPU

@@ -4,6 +4,7 @@ SOURCE=${SOURCE:=$HOME/go/src/github.com/u-root/u-root}
 KERNEL=${KERNEL:=$HOME/linuxboot/mainboards/intel/generic/kernel-noinitramfs}
 VMN=${VMN:=42}
 KEY=${KEY:=~/.ssh/cpu_rsa.pub:key.pub}
+UROOT=${UROOT:=~/go/src/github.com/u-root/u-root}
 
 echo NOTE: WE USED TO RUN CPUD AUTOMAGICALLY
 echo That turned out to be inconvenient for testing
@@ -17,13 +18,10 @@ echo -initcmd=/bbin/cpud \
 # $* is positioned where it is so you can use extra switches like -h or add files via, e.g., -files whatever
 # you can also add non-switch args too.
 # it allows you to configure the initramfs a bit more, with or without switches
-u-root \
-	-files   $KEY \
-	-uroot-source $SOURCE \
-	$* \
-	all \
-	cmds/cpud \
-	cmds/cpu \
+# The day when u-root was superconvenient to use is gone, done in by modules.
+# goanywhere makes it much less hard.
+go install github.com/u-root/gobusybox/src/cmd/goanywhere@latest
+goanywhere ${UROOT}/cmds/core/* ./cmds/cpu ./cmds/cpud  -- u-root -files $KEY
 
 echo NOT adding a host key at -files  ssh_host_rsa_key:etc/ssh/ssh_host_rsa_key