Ensure that package repositories are installed before packages

Also, renamed xerces-c-devel to libxerces-c-devel

puppet/modules/gdal-shibboleth/manifests/init.pp

 class gdal-shibboleth {
+	Package {
+		require => [
+			Yumrepo['security:shibboleth'],
+			Augeas['enable_eox-testing']
+		]
+	}
+
 	# enable EOX-testing repository
 	augeas { 'enable_eox-testing':
 		context	=> '/files/etc/yum.repos.d/eox-testing.repo',
@@ -6,7 +13,8 @@ class gdal-shibboleth {
 			'set eox-testing/enabled 1',
 			'set eox-testing-source/enabled 1',
 			'set eox-testing-noarch/enabled 1',
-		]
+		],
+		notify => Exec['shib_yum_clean_all'],
 	}
 
 	# enable security:shibboleth to install libxerces-c-devel
@@ -16,11 +24,16 @@ class gdal-shibboleth {
 		enabled => 1,
 		gpgcheck => 1,
 		gpgkey => "http://download.opensuse.org/repositories/security:/shibboleth/RHEL_6/repodata/repomd.xml.key",
+		notify => Exec['shib_yum_clean_all'],
+	}
+
+	exec { 'shib_yum_clean_all':
+		command		=> '/usr/bin/yum clean all',
+		refreshonly	=> true,
 	}
 
 	package { 'python-devel': ensure => 'latest' }
 	package { 'numpy': ensure => 'latest' }
-	package { 'xerces-c-devel': ensure => 'latest' }
 	package { 'libpng-devel': ensure => 'latest' }
 	package { 'giflib-devel': ensure => 'latest' }
 	package { 'libjpeg-turbo-devel': ensure => 'latest' }
@@ -53,5 +66,6 @@ class gdal-shibboleth {
 	package { 'java-1.6.0-openjdk-devel': ensure => 'latest' }
 	package { 'libtool': ensure => 'latest' }
 	package { 'perl-devel': ensure => 'latest' }
+	package { 'libxerces-c-devel': ensure => 'latest' }
 	package { 'libxerces-c-3_1': ensure => 'latest', require => Yumrepo['security:shibboleth'] }
 }