[light.tradfri] async support with resource observation. (#7815)

* [light.tradfri] Initial support for observe

* Update for pytradfri 2.0

* Fix imports

* Fix missing call

* Don't yield from add devices

* Fix imports

* Minor fixes to async code.

* Imports, formatting

* Docker updates, some minor async code changes.

* Lint

* Lint

* Update pytradfri

* Minor updates for release version

* Build fixes

* Retry observation if failed

* Revert

* Additional logging, fix returns

* Fix rename

* Bump version

* Bump version

* Support transitions

* Lint

* Fix transitions

* Update Dockerfile

* Set temp first

* Observation error handling

* Lint

* Lint

* Lint

* Merge upstream changes

* Fix bugs

* Fix bugs

* Fix bugs

* Lint

* Add sensor

* Add sensor

* Move sensor attrs

* Filter devices better

* Lint

* Address comments

* Pin aiocoap

* Fix bug if no devices

* Requirements

Dockerfile

@@ -11,9 +11,10 @@ MAINTAINER Paulus Schoutsen <Paulus@PaulusSchoutsen.nl>
 #ENV INSTALL_FFMPEG no
 #ENV INSTALL_LIBCEC no
 #ENV INSTALL_PHANTOMJS no
-#ENV INSTALL_COAP_CLIENT no
+#ENV INSTALL_COAP no
 #ENV INSTALL_SSOCR no
 
+
 VOLUME /config
 
 RUN mkdir -p /usr/src/app
@@ -25,7 +26,6 @@ RUN virtualization/Docker/setup_docker_prereqs
 
 # Install hass component dependencies
 COPY requirements_all.txt requirements_all.txt
-
 # Uninstall enum34 because some depenndecies install it but breaks Python 3.4+.
 # See PR #8103 for more info.
 RUN pip3 install --no-cache-dir -r requirements_all.txt && \