use phosphor-logging
Migrate all instances of std::cerr and std::cout to phosphor-logging
such as lg2::error, lg2::info, lg2::debug, ...
The use of modern logging infrastructure helps with development since
additional logging levels such as `debug` and `warning` are available.
Migrating the remaining logging calls helps to make the code more
readable and uniform.
Tested: Inspection, and on Tyan S8030
Restarted EM with patch applied.
Logs appear as usual.
```
Sep 15 13:52:46 s8030-bmc-30303035c0c1 entity-manager[23480]: Inventory Added: Supermicro PWS 920P SQ 0
Sep 15 13:52:46 s8030-bmc-30303035c0c1 entity-manager[23480]: Inventory Added: Supermicro PWS 920P SQ 1
Sep 15 13:52:46 s8030-bmc-30303035c0c1 entity-manager[23480]: Inventory Added: Tyan S8030 Baseboard
Sep 15 13:52:46 s8030-bmc-30303035c0c1 entity-manager[23480]: Inventory Added: MBX 1.57 Chassis
```
`busctl tree` output appears as before.
Did a power cycle to trigger a few more log prints
```
Sep 15 13:55:14 s8030-bmc-30303035c0c1 entity-manager[23480]: power match triggered
```
Created configuration file with missing fields to trigger error print.
```
{
  "Exposes": [],
  "Type": "error"
}
```
```
Sep 15 13:56:58 s8030-bmc-30303035c0c1 entity-manager[23659]: Finished loading json configuration in 7938ms
Sep 15 13:56:58 s8030-bmc-30303035c0c1 entity-manager[23659]: configuration file missing probe:
                                                               {"Exposes":[],"Type":"error"}
Sep 15 13:56:59 s8030-bmc-30303035c0c1 entity-manager[23659]: configuration file missing probe:
                                                               {"Exposes":[],"Type":"error"}
```
Change-Id: I3452f983c9c14cd02ab9b56451c4b3e4a13c3979
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/test/test_gpio_presence.cpp b/test/test_gpio_presence.cpp
index 727bc40..8ab309b 100644
--- a/test/test_gpio_presence.cpp
+++ b/test/test_gpio_presence.cpp
@@ -144,7 +144,7 @@
     {
         // expected, since cable 0 is gone.
         // have to do something here to shut up clang-tidy
-        std::cout << "" << std::endl;
+        lg2::info("");
     }
 
     ctx.request_stop();