fix /modules symlink problem (lorax deleting modules on host!)

symlinking /modules to '/lib/modules' inside the runtime image is fine,
but since we're operating outside the runtime image, the absolute
symlink will point to the host's /lib/modules, which can cause us to
delete kernel modules. Yikes.

Instead:
1) use /lib/modules rather than the symlink, and
2) use a relative symlink, just to be safe.

share/runtime-cleanup.tmpl

@@ -85,9 +85,9 @@ arch/x86/kvm
 """
 %>
 %for kmodpath in removekmods.split():
-    remove /modules/*/kernel/${kmodpath}
+    remove lib/modules/*/kernel/${kmodpath}
 %endfor
-remove /modules/*/{build,source,*.map}
+remove lib/modules/*/{build,source,*.map}
 ## NOTE: depmod gets re-run after cleanup finishes
 
 ## remove generated locales - anaconda >=16.x builds them at runtime

share/runtime-postinstall.tmpl

@@ -108,8 +108,8 @@ move usr/share/anaconda/loader.tr etc
 move usr/libexec/anaconda/auditd sbin
 
 ## for compatibility with Ancient Anaconda Traditions
-symlink /lib/modules /modules
-symlink /lib/firmware /firmware
+symlink ../lib/modules /modules
+symlink ../lib/firmware /firmware
 
 ## create_depmod_conf()
 append etc/depmod.d/dd.conf "search updates built-in"