Mer: Avoid VM auto connect during SSH key generation
Mer: Avoid VM auto connect during SSH key generation

Fixes odd behavior during emulator setup - false error message when
generating new SSH keys an VM is already running.

Steps to reproduce:

1. Start emulator VM
2. Setup this emulator in QtC - leave "Generate new SSH keys" checked

Question box is displayed: "Connection to the "SailfishOS Emulator"
virtual machine failed recently. Do you want to reset the virtual
machine first?".

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