logging: remove spaces in entry definition

phosphor-logging / journald does not allow a space in entry
headers.  Change "FOO = %s" entry definitions to "FOO=%s".

Tested: After change observe logging entries using `journalctl
--output json-pretty` and see the FILENAME appear in an entry.

  "FILENAME" : "/usr/share/phosphor-virtual-sensor/virtual_sensor_config.json",

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Iff035554db5e65c54cceb23cf203d72872ad1455
diff --git a/virtualSensor.cpp b/virtualSensor.cpp
index 8b2792a..096845e 100644
--- a/virtualSensor.cpp
+++ b/virtualSensor.cpp
@@ -324,7 +324,7 @@
     if (!jsonFile.is_open())
     {
         log<level::ERR>("config JSON file not found",
-                        entry("FILENAME = %s", configFile.c_str()));
+                        entry("FILENAME=%s", configFile.c_str()));
         throw std::exception{};
     }
 
@@ -332,7 +332,7 @@
     if (data.is_discarded())
     {
         log<level::ERR>("config readings JSON parser failure",
-                        entry("FILENAME = %s", configFile.c_str()));
+                        entry("FILENAME=%s", configFile.c_str()));
         throw std::exception{};
     }
 
@@ -373,7 +373,7 @@
                 if (unitMap.find(sensorType) == unitMap.end())
                 {
                     log<level::ERR>("Sensor type is not supported",
-                                    entry("TYPE = %s", sensorType.c_str()));
+                                    entry("TYPE=%s", sensorType.c_str()));
                 }
                 else
                 {
@@ -384,7 +384,7 @@
                         bus, objPath.c_str(), j, name);
 
                     log<level::INFO>("Added a new virtual sensor",
-                                     entry("NAME = %s", name.c_str()));
+                                     entry("NAME=%s", name.c_str()));
                     virtualSensorPtr->updateVirtualSensor();
 
                     /* Initialize unit value for virtual sensor */