[Testing] Create testcases for missing or invalid requestBody

[kmohr-soprasteria]

requestBody:

• /v1/add-controller
• /v1/remove-controller
• /v1/notify-controller-attribute-value-changes
• /v1/notify-controller-object-creations
• /v1/notify-controller-object-deletions
• /v1/notify-device-alarms
• /v1/notify-device-attribute-value-changes
• /v1/notify-device-object-creations
• /v1/notify-device-object-deletions

no requestBody (i.e. excluded from tests; a provided requestBody will just be ignored):

• /v1/listen-to-controllers