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/test/utest.cpp b/test/utest.cpp
index 0d3c2c9..4572c55 100644
--- a/test/utest.cpp
+++ b/test/utest.cpp
@@ -62,7 +62,7 @@
         auto t = targets.begin();
         ASSERT_EQ((*t)->getPos(), 0);
 
-        ASSERT_EQ((*t)->getPath(), masterDir);
+        ASSERT_EQ((*t)->getCFAMPath(), masterDir);
     }
 
 
@@ -95,7 +95,7 @@
                 path << _directory << "/slave@0" << i << ":00/raw";
             }
 
-            ASSERT_EQ(t->getPath(), path.str());
+            ASSERT_EQ(t->getCFAMPath(), path.str());
             i++;
         }
     }