tree f5df8fabd26b17b2e1a6870f0bc4a74e7dee68f2
parent a291ce1acfc8935dc69675c2e29bf1dee4f68ccd
author Patrick Williams <patrick@stwcx.xyz> 1675972458 -0600
committer Patrick Williams <patrick@stwcx.xyz> 1675973703 -0600

config-file: search multiple directories

Restricting the config file to `/usr/share` makes testing difficult
and prevents the config file from being present on a, typically for
the BMC, read-write volume.  Change the config loading code to search:

    1. pwd
    2. /var/lib/phosphor-virtual-sensor
    3. /usr/share/phosphor-virtual-sensor

Tested:

Ran strace on the changes and observed the expected file search.
```
getcwd("pwd/phosphor-virtual-sensor/builddir", 4096) = 75
newfstatat(AT_FDCWD, "pwd/phosphor-virtual-sensor/builddir/virtual_sensor_config.json", 0x7fff60a0af90, 0) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/var/lib/phosphor-virtual-sensor/virtual_sensor_config.json", 0x7fff60a0af90, 0) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/usr/share/phosphor-virtual-sensor/virtual_sensor_config.json", 0x7fff60a0af90, 0) = -1 ENOENT (No such file or directory)
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I70854d565a3b13cd48c27a80da84de54c00a0603