fix(greeter): reconnect to DDM on service changes - #1154
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Watch the display manager D-Bus lifecycle. Close the stale authentication socket when the service disappears and refresh AuthInfo using the existing connection path when it returns. Log: DDM 成功重启后，旧认证 socket 会失效。Treeland 监听 org.deepin.DisplayManager 的注销和注册，在服务注销时关闭旧 socket， 并在服务重新注册后重新获取 AuthInfo()、连接新的认证 socket。 该机制只处理 DDM 成功恢复后的认证链路，不处理 start-limit-hit。 PMS: Influence: Affects greeter-to-DDM authentication socket recovery after a successful DDM restart.
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zccrs
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Watch the display manager D-Bus lifecycle. Close the stale authentication socket when the service disappears and refresh AuthInfo using the existing connection path when it returns.
Log: DDM 成功重启后，旧认证 socket 会失效。Treeland 监听
org.deepin.DisplayManager 的注销和注册，在服务注销时关闭旧 socket， 并在服务重新注册后重新获取 AuthInfo()、连接新的认证 socket。
该机制只处理 DDM 成功恢复后的认证链路，不处理 start-limit-hit。
PMS:
Influence: Affects greeter-to-DDM authentication socket recovery after a successful DDM restart.
需要合入ddm相关的修改 linuxdeepin/ddm#104