log-manager: enable non-standard path for local tests

Enable the log-manager to be launched with a path other than
`/var/phosphor-logging` to allow it to be ran on a development system
for test purposes.  This required some refactoring throughout as to
how paths were handled.

Tested:

After running tests, `/tmp/phosphor-logging` is populated with
entries.  Launching `./builddir/phosphor-log-manager
/tmp/phosphor-logging`, the log-manager will have the entries on
dbus:

```
$ busctl --user tree xyz.openbmc_project.Logging
└─ /xyz
  └─ /xyz/openbmc_project
    └─ /xyz/openbmc_project/logging
      ├─ /xyz/openbmc_project/logging/entry
      │ ├─ /xyz/openbmc_project/logging/entry/100
      │ ├─ /xyz/openbmc_project/logging/entry/101
      │ ├─ /xyz/openbmc_project/logging/entry/102
      │ ├─ /xyz/openbmc_project/logging/entry/103
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I84968edeed0dcf73aaf8bb653060b6d3400b9b7b
diff --git a/test/openpower-pels/meson.build b/test/openpower-pels/meson.build
index d2a44c9..14021a9 100644
--- a/test/openpower-pels/meson.build
+++ b/test/openpower-pels/meson.build
@@ -67,7 +67,7 @@
 openpower_test_lib = static_library(
     'openpower_test_lib',
     'pel_utils.cpp',
-    'paths.cpp',
+    'pel_paths.cpp',
     libpel_sources,
     peltool_sources,
     '../common.cpp',