Karaf camel:endpoint-list command to list endpoints in all camel contexts

Refer to the uptream issue, https://issues.apache.org/jira/browse/CAMEL-10608.

With Fuse 6.2, we made the change to include an argument with the command to specify the camelContext to list the route URI's.

For clarity the difference is,

In Fuse 6.2,
JBossFuse:karaf@root> camel:endpoint-list cbr-example-context
Uri Status
— ------
file://work/cbr/input Started
file://work/cbr/output/others Started
file://work/cbr/output/uk Started
file://work/cbr/output/us Started

JBossFuse:karaf@root> camel:endpoint-list eip-example-context
Uri Status
— ------
direct://filter Started
direct://splitter Started
direct://wiretap Started
file://work/eip/archive Started
file://work/eip/input Started

Whereas, in Fuse 6.1.x, the command displayed everything for you including the route URI for all the camelContext.

JBossFuse:karaf@root> camel:endpoint-list
Context Uri Status
------- — ------
cbr-example-context file://work/cbr/input Started
cbr-example-context file://work/cbr/output/others Started
cbr-example-context file://work/cbr/output/uk Started
cbr-example-context file://work/cbr/output/us Started
eip-example-context direct://filter Started
eip-example-context direct://splitter Started
eip-example-context direct://wiretap Started
eip-example-context file://work/eip/archive Started
eip-example-context file://work/eip/input Started

The feature should be included to be able to run "camel:endpoint-list" and get all the endpoints from all the context any context is not specified.