Have the Target class manage the file descriptor

The sysfs file descriptor will now stay open from first
use until the Target class is destroyed.

Change-Id: Ib9803a527115cc75ecc9a5351d1e748ccd54a993
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/filedescriptor.cpp b/filedescriptor.cpp
index 3b1b096..c8bcab0 100644
--- a/filedescriptor.cpp
+++ b/filedescriptor.cpp
@@ -19,7 +19,7 @@
 
 namespace openpower
 {
-namespace p9_util
+namespace util
 {
 
 FileDescriptor::FileDescriptor(const std::string& path)