[QA] nemo plugin spams text console

[jnweiger]

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• [X] I checked for similar issues, but could not find any. I also checked the closed issues. I could not contribute additional information to any existing issue.
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Describe the QA issue

Seen while testing client 2.11.1 on Linux Mint

• connect client with e.g. demo.owncloud.org
• Install nemo *-nemo browser integration package.
• kill all nemo
• start nemo & from the command line. Keep that shell open
• quit the owncloud client
• nemo starts producing messages on the text console. e.g.

Could not connect to unix socket /run/user/1000/testpilotcloud/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/btr/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/ocfablabnbg/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/testpilotcloud/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/btr/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/ocfablabnbg/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/testpilotcloud/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/btr/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/ocfablabnbg/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/testpilotcloud/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/btr/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/ocfablabnbg/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/testpilotcloud/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/btr/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/ocfablabnbg/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/testpilotcloud/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/btr/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/ocfablabnbg/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/testpilotcloud/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/btr/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/ocfablabnbg/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/testpilotcloud/socket. [Errno 2] No such file or directory
Could not connect to unix socket /run/user/1000/btr/socket. [Errno 2] No such file or directory

• One message per 10 seconds.
• The shell is thus basically unusable.

Expected behaviour:

• only one message immediately, then none, or only hourly reminders.

Steps to reproduce the issue

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Screenshots

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Expected behavior

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Actual behavior

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