Remove volummount implanted by other operators to avoid conflicts

[chenhuazhong]

Some operators will automatically create pods with "/etc/localtime" volumemounts, which will lead to volumemounts conflicts,

The Pod "nginx" is invalid:

• spec.containers[0].volumeMounts[4].mountPath: Invalid value: "/etc/localtime": must be unique
• spec.containers[0].volumeMounts[5].mountPath: Invalid value: "/usr/share/zoneinfo": must be unique

[codecov-commenter]

Codecov Report

Merging #27 (0a8e32d) into master (745ec3f) will increase coverage by 0.79%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   73.73%   74.53%   +0.79%     
==========================================
  Files           5        5              
  Lines         575      593      +18     
==========================================
+ Hits          424      442      +18     
  Misses        117      117              
  Partials       34       34              

Impacted Files	Coverage Δ
pkg/inject/inject.go	93.75% <100.00%> (+0.47%)	⬆️

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