F #6912: Fix LVM Thin script requirements (#3752)

Signed-off-by: josepselga <jselga@opennebula.io>
(cherry picked from commit 29a294d)

Author: Josep Selga

src/tm_mad/lib/backup_lvmthin.rb

@@ -15,6 +15,25 @@
 # See the License for the specific language governing permissions and        #
 # limitations under the License.                                             #
 #--------------------------------------------------------------------------- #
+
+ONE_LOCATION = ENV['ONE_LOCATION'] unless defined?(ONE_LOCATION)
+
+if !ONE_LOCATION
+    LIB_LOCATION      ||= '/usr/lib/one'
+    RUBY_LIB_LOCATION ||= '/usr/lib/one/ruby'
+    GEMS_LOCATION     ||= '/usr/share/one/gems'
+else
+    LIB_LOCATION      ||= ONE_LOCATION + '/lib'
+    RUBY_LIB_LOCATION ||= ONE_LOCATION + '/lib/ruby'
+    GEMS_LOCATION     ||= ONE_LOCATION + '/share/gems'
+end
+
+# %%RUBYGEMS_SETUP_BEGIN%%
+require 'load_opennebula_paths'
+# %%RUBYGEMS_SETUP_END%%
+
+$LOAD_PATH << RUBY_LIB_LOCATION
+
 $LOAD_PATH.unshift('/var/tmp/one')
 
 require 'fileutils'