bus: add error handling for bus-open calls

sd-bus can return ENOMEDIUM in some cases for bus-open calls, so
we need to detect this condition rather than blindly ignoring the
return value. Add appro

bus: add error handling for bus-open calls

sd-bus can return ENOMEDIUM in some cases for bus-open calls, so
we need to detect this condition rather than blindly ignoring the
return value. Add appropriate error handling.

Tested:
```
$ sudo builddir/example/calculator-server
Password:
terminate called after throwing an instance of 'sdbusplus::exception::SdBusError'
what(): sdbusplus::bus::bus sdbusplus::bus::new_default(): System.Error.ENOMEDIUM: No medium found
zsh: IOT instruction sudo builddir/example/calculator-server
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I7b82a9e182f21a1cbbb80fc3dbfeaaa0174a369d

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bus: un-inline functions

Due to additional upstream error results, the bus creation functions
need better error handling. This will result in larger functions
that are no longer a direct sd-bus cal

bus: un-inline functions

Due to additional upstream error results, the bus creation functions
need better error handling. This will result in larger functions
that are no longer a direct sd-bus call and probably shouldn't be
inlined. Move the functions to the `bus.cpp` file.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: If141ef74a62fd04b3bbf58b0720da2a9410481a7

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server: un-inline various large functions

Save approximiately 70k (ARM32) of size from the generated library of
libphosphor-dbus.so by un-inlining various large functions.

Signed-off-by: Patrick Wi

server: un-inline various large functions

Save approximiately 70k (ARM32) of size from the generated library of
libphosphor-dbus.so by un-inlining various large functions.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ie238ca7807960bf1577dcbb272226f197de84b01

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