LXC: add HOME environment variable

We lacked of HOME environment variable,
set 'HOME=/' as default.

The kernel sets up $HOME for the init process.
Therefore any init can assume that $HOME is set.
libvirt currently violates that implicit rule.
Signed-off-by: NChen Hanxiao <chenhanxiao@cn.fujitsu.com>
Signed-off-by: NEric Blake <eblake@redhat.com>

src/lxc/lxc_container.c

@@ -236,6 +236,7 @@ static virCommandPtr lxcContainerBuildInitCmd(virDomainDefPtr vmDef,
     virCommandAddEnvString(cmd, "PATH=/bin:/sbin");
     virCommandAddEnvString(cmd, "TERM=linux");
     virCommandAddEnvString(cmd, "container=lxc-libvirt");
+    virCommandAddEnvString(cmd, "HOME=/");
     virCommandAddEnvPair(cmd, "container_uuid", uuidstr);
     if (nttyPaths > 1)
         virCommandAddEnvPair(cmd, "container_ttys", virBufferCurrentContent(&buf));