修复因网络问题导致kunpeng下载失败导致so被删除，无法升级的问题 #217
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当kunpeng.xxx.zip下载失败时，因为未作判断，会导致kunpeng.so被os.remove掉，然而so被删除之后，后续无法再load，进而导致后续的升级过程全部失败，系统会失去漏洞扫描功能...
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当kunpeng.xxx.zip下载失败时，因为未作判断，会导致在update_version执行过程中kunpeng.so被os.remove掉。
然而so被删除之后，后续无法再_load_kunpeng，进而导致后续的升级过程全部失败，系统会失去漏洞扫描功能...
代码主要是针对是否load成功增加了一些判断，在load不成功的情况下也能够update，从而使系统持续运行。