bugfix: nacos-config.py script could not run with namespace

[luorenjin]

将!=改成<= 即可

Ⅰ. Describe what this PR did

运行：python nacos-config.py 172.16.xxx.xxx:31263 seata
提示：python nacos-config.py nacosAddr
看逻辑得知，请求的参数数量判断逻辑错误了

源逻辑：
if len(sys.argv) != 2: print ('python nacos-config.py nacosAddr') exit()
修改后：
if len(sys.argv) <= 2: print ('python nacos-config.py nacosAddr') exit()
可以正确执行，带 namespace 参数的命令

Ⅱ. Does this pull request fix one issue?

自己发现的

Ⅲ. Why don't you add test cases (unit test/integration test)?

修改后保存：
执行 python nacos-config.py 172.16.xxx.xxx:31263 seata 成功，数据正确写入了nacos

Ⅳ. Describe how to verify it

查看命令窗口日志，并查看nacos配置，是否正确写入

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #2932 into develop will decrease coverage by 0.01%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2932      +/-   ##
=============================================
- Coverage      50.28%   50.27%   -0.02%     
+ Complexity      3063     3062       -1     
=============================================
  Files            600      600              
  Lines          19503    19503              
  Branches        2404     2403       -1     
=============================================
- Hits            9807     9805       -2     
  Misses          8712     8712              
- Partials         984      986       +2     

Impacted Files	Coverage Δ	Complexity Δ
...o/seata/server/coordinator/DefaultCoordinator.java	54.63% <0.00%> (-0.52%)	28.00% <0.00%> (-2.00%)
...in/java/io/seata/server/session/GlobalSession.java	83.71% <0.00%> (-0.46%)	71.00% <0.00%> (-1.00%)

[slievrly]

LGTM

[slievrly]

@luorenjin modify the pr title in En.

[funky-eyes]

LGTM

[funky-eyes]

请修改标题为英文，并且以bugfix: 开头

[l81893521]

LGTM

[Ever2154]

<=似乎依然不行，使用python nacos-config.py 192.168.168.128:1111 返回python nacos-config.py nacosAddr，

[Ever2154]

namespace是可选参数，个人感觉应该是<2