[Rpm-maint] [rpm-software-management/rpm] skip previous only when the current file is normal (PR #1853)

[Einsler Lee]

### Current behavior
#### 1. If rpm remove package files in this order: normal_file -> wrongcolor_file
normal_file will first be marked as FA_ERASE. When removing wrongcolor_file, rpm find the normal_file (with the same name) has been marked as FA_ERASE, then rpm will change the normal_file's action to FA_SKIP in 		`rpmfsSetAction(otherFs, otherFileNum, FA_SKIP);`. wrongcolor_file will also be marked as FA_SKIP later. So both two files's action will be FA_SKIP.

#### 2. If rpm remove package files in this order: wrongcolor_file -> normal_file

wrongcolor_file will be marked as FA_SKIP. When removing normal_file, rpm find the wrongcolor_file (with the same name) has been marked as FA_SKIP (not FA_ERASE), then rpm will change the normal_file's action to FA_SKIP. Eventually, both two files's action will be FA_SKIP too.

### With patches applied

#### 1. For the first scene
Only skip previous file when the current file is normal. 

#### 2. For the second scene
Set wrongcolor_file's action to FA_SKIPCOLOR, and only skip the current file when the previous file's action is not FA_ERASE nor FA_SKIPCOLOR.

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