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/CPUSensor.cpp b/src/CPUSensor.cpp
index 1ebe6c6..e955fef 100644
--- a/src/CPUSensor.cpp
+++ b/src/CPUSensor.cpp
@@ -40,9 +40,8 @@
                      std::vector<thresholds::Threshold>&& thresholdsIn,
                      const std::string& sensorConfiguration, int cpuId,
                      bool show, double dtsOffset) :
-    Sensor(boost::replace_all_copy(sensorName, " ", "_"),
-           std::move(thresholdsIn), sensorConfiguration, objectType, false,
-           false, 0, 0, conn, PowerState::on),
+    Sensor(escapeName(sensorName), std::move(thresholdsIn), sensorConfiguration,
+           objectType, false, false, 0, 0, conn, PowerState::on),
     objServer(objectServer), inputDev(io), waitTimer(io), path(path),
     privTcontrol(std::numeric_limits<double>::quiet_NaN()),
     dtsOffset(dtsOffset), show(show), pollTime(CPUSensor::sensorPollMs),