tests/kolainst: Add make localinstall

When hacking and testing locally with `cosa build-fast` and `kola run`,
I prefer to leave testing framework stuff within the work directory
rather than installed in my pet container. Add a `localinstall` target
for this which puts the tests in `tests/kola`. Then a simple `kola run`
will pick it up.

tests/kolainst/Makefile

@@ -15,3 +15,7 @@ install:
 	install -D -m 0755 -t $(KOLA_TESTDIR)/nondestructive-rs ../inst/target/release/ostree-test
 	install -D -m 0644 destructive-stamp.ign $(KOLA_TESTDIR)/destructive-rs/config.ign
 	./install-wrappers.sh destructive-list.txt $(KOLA_TESTDIR)/destructive-rs
+
+localinstall:
+	rm -rf ../kola
+	make install KOLA_TESTDIR=../kola