Ensure that app lib symlinks are correctly labeled when created.

At present, the app lib symlinks are created before setting
the package directory security context, and therefore default
to system_data_file.  Upon a later restorecon_recursive,
they are relabeled to the same type as the package directory,
e.g. app_data_file.  Avoid this inconsistency by setting the
package directory security context before creating the symlink
so that it inherits the same security context.

Change-Id: I09a2fd6f65c8ee041ba40bcd54f36fa8a303795a
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>