libsemanage: Perform access check using euid instead of uid v2

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To: selinux@xxxxxxxxxxxxx
Subject: libsemanage: Perform access check using euid instead of uid v2
From: Vit Mojzis <vmojzis@xxxxxxxxxx>
Date: Tue, 6 Mar 2018 12:58:05 +0100

Changes: 
  - replace semanage_copy_file by copy_file_if_exists to make sure "retval" is 0 if the file does not exist
  - restructure if statements to be more clear ("fail" is last part of the statement)
  - replace read test (attempt to open the file) by stat() call

Follow-Ups:
- [PATCH 3/3] libsemanage: replace access() checks to make setuid programs work
  - From: Vit Mojzis
- [PATCH 2/3] libsemanage: remove access() check to make setuid programs work
  - From: Vit Mojzis
- [PATCH 1/3] libsemanage: remove access() check to make setuid programs work
  - From: Vit Mojzis

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