Fix daemon crash while deleting multiple removed services

[GF-4352] webos-connman-adapter crashes when wifi network is not visible anymore
[GF-5031] CCC: Fix webos-connman-adapter crash when wifi is turned off

Open-webOS-DCO-1.0-Signed-off-by: Sapna Todwal <sapna.todwal@lge.com>

Change-Id: Ie7ee364ced25fd467ae2c143f464709b4e98cf03
Reviewed-on: https://g2g.palm.com/2087
Reviewed-by: Build Verification
Reviewed-by: Simon Busch <simon.busch@lge.com>
Tested-by: Simon Busch <simon.busch@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>