Add tests around config reload

server/configs/reload/invalid.conf

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+# Invalid config file
+trace: 

server/configs/reload/reload.conf

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+
+# Simple config file
+
+listen: localhost:4242
+
+http: 8222
+
+authorization {
+  user:     derek
+  password: bella
+  timeout:  1
+}
+
+# logging options
+debug:   false
+trace:   false
+logtime: false
+log_file: "/tmp/gnatsd.log"
+syslog: true
+remote_syslog: "udp://foo.com:33"
+
+# pid file
+pid_file: "/tmp/gnatsd.pid"
+
+# prof_port
+prof_port: 6543
+
+# max_connections
+max_connections: 100
+
+# maximum control line
+max_control_line: 2048
+
+# maximum payload
+max_payload: 65536
+
+# ping interval and no pong threshold
+ping_interval: 60
+ping_max: 3
+
+# how long server can block on a socket write to a client
+write_deadline: "3s"

server/configs/reload/reload_unsupported.conf

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+
+# Simple config file
+
+listen: localhost:4242
+
+http: 8222
+
+authorization {
+  user:     derek
+  password: bella
+  timeout:  1
+}
+
+# logging options
+debug:   true
+trace:   false
+logtime: false
+log_file: "/tmp/gnatsd.log"
+syslog: true
+remote_syslog: "udp://foo.com:33"
+
+# pid file
+pid_file: "/tmp/gnatsd.pid"
+
+# prof_port
+prof_port: 6543
+
+# max_connections
+max_connections: 100
+
+# maximum control line
+max_control_line: 2048
+
+# maximum payload
+max_payload: 65536
+
+# ping interval and no pong threshold
+ping_interval: 60
+ping_max: 3
+
+# how long server can block on a socket write to a client
+write_deadline: "3s"

server/configs/reload/test.conf

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+
+# Simple config file
+
+listen: localhost:4242
+
+http: 8222
+
+authorization {
+  user:     derek
+  password: bella
+  timeout:  1
+}
+
+# logging options
+debug:   false
+trace:   true
+logtime: false
+log_file: "/tmp/gnatsd.log"
+syslog: true
+remote_syslog: "udp://foo.com:33"
+
+# pid file
+pid_file: "/tmp/gnatsd.pid"
+
+# prof_port
+prof_port: 6543
+
+# max_connections
+max_connections: 100
+
+# maximum control line
+max_control_line: 2048
+
+# maximum payload
+max_payload: 65536
+
+# ping interval and no pong threshold
+ping_interval: 60
+ping_max: 3
+
+# how long server can block on a socket write to a client
+write_deadline: "3s"