Move TemporaryFile class to root directory

Source code that is shared across applications is located in the root
directory of the phosphor-power repository.

The TemporaryFile class was originally c

Move TemporaryFile class to root directory

Source code that is shared across applications is located in the root
directory of the phosphor-power repository.

The TemporaryFile class was originally created for the
phosphor-regulators application. However it is general purpose and is
now needed by the phosphor-power-sequencer application.

Move the TemporaryFile class to the root directory. Update C++ files
that use the TemporaryFile class since it is now in a different
namespace. Update affected meson.build files.

Change-Id: I6d18080d2436a5da87b7ab51ac003c503caa36a3
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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regulators: Create FFDCFile class

Create C++ class for a file that contains FFDC (first failure data
capture) data.

This class is used to store FFDC data in an error log. The FFDC data is
passed t

regulators: Create FFDCFile class

Create C++ class for a file that contains FFDC (first failure data
capture) data.

This class is used to store FFDC data in an error log. The FFDC data is
passed to the error logging system using a file descriptor.

The constructor creates the file and opens it for both reading and
writing. The getFileDescriptor() method returns the file descriptor for
reading/writing the file. The destructor closes and deletes the file.

Also moved the test utility functions makeFileUnRemovable() and
makeFileRemovable() to test_utils.hpp so they can be used by multiple
testcases.

Change-Id: Iddef488a28e83a0df7e7f6955c3217ecb3ec2d51

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