If operator needs to enter guest agent instance for troubleshooting,
they need to create a keypair, upload it as Trove user specifically,
create a security group and define it's UUID in trove.conf
This process is quite cumbersome and time consuming, thus this
patch implements mentioned fuctionality and can be enabled
with a single variable.
Process is alike to what we have and been using for Octavia for a while.
Change-Id: I29984c565c808bca79ef39a02e79d9b015a70786
3035e25333