package/snagboot: new package

This commit adds a package for Snagboot, the open-source
vendor-neutral recover and reflashing tool for embedded targets. We
install the dependencies needed for snagrecover and snagflash, but we
don't bother installing the dependencies of the GUI-based snagfactory,
as that would require Kivy on the host, which is Qt based.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

support/testing/tests/package/test_snagboot.py

@@ -0,0 +1,16 @@
+import infra.basetest
+
+
+class TestHostSnagboot(infra.basetest.BRHostPkgTest):
+    hostpkgs = ["host-snagboot"]
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_HOST_SNAGBOOT=y
+        """
+
+    def test_run(self):
+        cmd = ["host/bin/snagrecover", "--help"]
+        infra.run_cmd_on_host(self.builddir, cmd)
+
+        cmd = ["host/bin/snagflash", "--help"]
+        infra.run_cmd_on_host(self.builddir, cmd)