psusensor: fix psu pwm sensor name

Current bug is that psusensor service does not create pwm sensor object
if pid fan configuration has spaces in Name field, like
{
...
"Name" : "PSU$BUS $ADDRESS Fan 1"
"Outputs": [
	"Pwm PSU$BUS $ADDRESS Fan 1"
                ],
...
}

Fix:
Pwm name need to be escaped, which currently replaces " " with "_"
before being passed to CreatePwmSensor in PSUSensor service.
PwmSensor constructor takes the name as is.

Since the escape algorithm may change in the future,
add a helper function escapeName() and update dbus-sensors
to use this helper funtion when sensors are created.
escapeName() currently calls boost replace_all_copy(name," ", "_"),
so it does not introduce functional changes except the bug identified
above.

Tested:
No regression found for existing working sensors.
Sensors are created as before with the same sensor name.

Fix for non-working case works correctly now.
psu pwm sensor name with space are created correctly with the change.
busctl tree xyz.openbmc_project.PSUSensor
...
    |-/xyz/openbmc_project/control
    | `-/xyz/openbmc_project/control/fanpwm
    |   |-/xyz/openbmc_project/control/fanpwm/Pwm_PSU17_2_Fan_1
    |   |-/xyz/openbmc_project/control/fanpwm/Pwm_PSU17_2_Fan_2
...

Signed-off-by: Zhikui Ren <zhikui.ren@intel.com>
Change-Id: If3b60f93de324e59cc3d774285c23bf50a6f989c
diff --git a/src/PSUSensor.cpp b/src/PSUSensor.cpp
index 362155a..4e0d32b 100644
--- a/src/PSUSensor.cpp
+++ b/src/PSUSensor.cpp
@@ -18,7 +18,6 @@
 
 #include <PSUSensor.hpp>
 #include <boost/algorithm/string/predicate.hpp>
-#include <boost/algorithm/string/replace.hpp>
 #include <boost/asio/read_until.hpp>
 #include <boost/date_time/posix_time/posix_time.hpp>
 #include <sdbusplus/asio/connection.hpp>
@@ -46,9 +45,8 @@
                      const std::string& sensorUnits, unsigned int factor,
                      double max, double min, double offset,
                      const std::string& label, size_t tSize, double pollRate) :
-    Sensor(boost::replace_all_copy(sensorName, " ", "_"),
-           std::move(thresholdsIn), sensorConfiguration, objectType, false,
-           false, max, min, conn, powerState),
+    Sensor(escapeName(sensorName), std::move(thresholdsIn), sensorConfiguration,
+           objectType, false, false, max, min, conn, powerState),
     std::enable_shared_from_this<PSUSensor>(), objServer(objectServer),
     inputDev(io), waitTimer(io), path(path), sensorFactor(factor),
     sensorOffset(offset), thresholdTimer(io)