CI: Fix Mac builds on Travis CI's Xcode 8.3 image

The Travis CI Xcode 8.3 image uses macOS 10.12, where some changes were
made to productsign, and Apple's documentation didn't clearly reflect
this. This commit should fix Mac builds on Travis for Xcode 8.3 and
clean up the job log.

CI/before-deploy-osx.sh

@@ -48,7 +48,7 @@ security set-keychain-settings -t 3600 -u build.keychain
 hr "Importing certs into keychain"
 security import ./Certificates.p12 -k build.keychain -T /usr/bin/productsign -P ""
 hr "Signing Package"
-productsign --sign 'Developer ID Installer: Hugh Bailey (2MMRE5MTB8)' ./OBS.pkg ./$FILENAME
+productsign --sign 2MMRE5MTB8 ./OBS.pkg ./$FILENAME
 
 # Move to the folder that travis uses to upload artifacts from
 hr "Moving package to nightly folder for distribution"

CI/install/osx/build_app.py

@@ -86,7 +86,7 @@ for i in candidate_paths:
 			try:
 				out = check_output("{0}otool -L '{1}'".format(args.prefix, path), shell=True,
 						universal_newlines=True)
-				if "is not an object file" in out:
+				if "The file was not recognized as a valid object file" in out:
 					continue
 			except:
 				continue