MemoryInspectorPanel does not query fully qualified domain name (FQDN)

Querying the FQDN causes delays when the DNS is slow as this information
is always requested even if the MemoryInspectorPanel is not shown.
FQDN is replaced with the hostname and the user is presented with an
edit box to fill in the FQDN if required.

Change-Id: Id74f3252cfb6819820ec207d012fe086135bc369
Merge topic '14478-system-query' into next

d0406da MemoryInspectorPanel does not query fully qualified domain name (FQDN)