[analyzer][tests][NFC] Add EOF newlines, normalize reference expected files

Reference expected files not ending with a newline are normalized to
have said newlines. Additionally `plist-macros-with-expansion.cpp.plist`
is modified to add a line that is ignored by `%diff_plist`, but not by
the more sensitive pattern proposed by
http://lists.llvm.org/pipermail/cfe-dev/2019-April/061904.html for
`%normalize_plist`.

llvm-svn: 359692

clang/test/Analysis/Inputs/expected-plists/plist-macros-with-expansion.cpp.plist

@@ -2,6 +2,7 @@
 <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+ <key>clang_version</key>
  <key>diagnostics</key>
  <array>
   <dict>

clang/test/Analysis/Inputs/expected-plists/retain-release.m.objc.plist

@@ -26110,4 +26110,4 @@
   <string>/Volumes/Transcend/code/monorepo/llvm-project/clang/test/Analysis/retain-release.m</string>
  </array>
 </dict>
-</plist>
+</plist>

clang/test/Analysis/Inputs/expected-plists/retain-release.m.objcpp.plist

@@ -26179,4 +26179,4 @@
   <string>/Volumes/Transcend/code/monorepo/llvm-project/clang/test/Analysis/retain-release.m</string>
  </array>
 </dict>
-</plist>
+</plist>