Fix whitespace trim issue.
Fix whitespace trim issue.

If target_file does not end in whitespace, strip will return nil to @target_url.
VMC does create this file with whitespace at the end however this may not
always happen if other applications modify this file. Other methods in the
Config class that read files use ".strip".

Change-Id: I1e4f88fe0b796af8872614700df01d66ba9b5121

ack/af