[Bug server/16342] New: stap --list-servers lists spurious line when having two stap-serverd instances

["jlebon at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16342

            Bug ID: 16342
           Summary: stap --list-servers lists spurious line when having
                    two stap-serverd instances
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: server
          Assignee: systemtap at sourceware dot org
          Reporter: jlebon at redhat dot com

Running a single instance (using service stap-server start):

[root@machine.domain ~]# stap --list-servers=all
Systemtap Compile Server Status for 'all'
 host=machine.domain address=XX.XX.XX.XX port=36676
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:a3:a2:73"

Then, we start a second instance, using e.g. runuser -u test --
/usr/libexec/systemtap/stap-serverd --log=/tmp/mystaplog

[root@machine.domain ~]# stap --list-servers=all
Systemtap Compile Server Status for 'all'
 host=machine.domain address=XX.XX.XX.XX port=53964
sysinfo="3.10.0-55.el7.x86_64 x86_64" version=2.4 certinfo="00:9d:b9:70:b9"
 host=machine address=XX.XX.XX.XX port=36676 sysinfo="3.10.0-55.el7.x86_64
x86_64" version=2.4 certinfo="00:9d:a3:a2:73"
 host=machine.domain address=offline port=unknown sysinfo="unknown"
version=unknown certinfo="00:9d:a3:a2:73"

It seems like the last line makes no sense. It has the same certificate as the
previous line (which correspond to the initial instance), but a different
hostname.

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