entity-manager: move bool inProgress to class

```
static bool inProgress
```
is moved to EM class as
```
bool propertiesChangedInProgress
```
to get rid of the static variable.

Tested: On Tyan S8030

```
Jul 01 09:59:26 s8030-bmc-30303035c0c1 entity-manager[4204]: Inventory Added: Supermicro PWS 920P SQ 0
Jul 01 09:59:26 s8030-bmc-30303035c0c1 entity-manager[4204]: Inventory Added: Supermicro PWS 920P SQ 1
Jul 01 09:59:26 s8030-bmc-30303035c0c1 entity-manager[4204]: Inventory Added: chassis
Jul 01 09:59:26 s8030-bmc-30303035c0c1 entity-manager[4204]: Inventory Added: MBX 1.57 Chassis
```

busctl tree output as expected

Change-Id: I63231cfc155c1c955c8d11f8a32359be4a95e19c
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/src/entity_manager/entity_manager.hpp b/src/entity_manager/entity_manager.hpp
index 81c2136..f730dde 100644
--- a/src/entity_manager/entity_manager.hpp
+++ b/src/entity_manager/entity_manager.hpp
@@ -68,6 +68,8 @@
     bool scannedPowerOff = false;
     bool scannedPowerOn = false;
 
+    bool propertiesChangedInProgress = false;
+
     void startRemovedTimer(boost::asio::steady_timer& timer,
                            nlohmann::json& systemConfiguration);
 };