glance-replicator: enable logging exceptions into log file
glance-replicator: enable logging exceptions into log file

bug 1213779

Currently, glance-replicator provides option to enable logging
information into a specified file. But exceptions are not logged
into the log file when they are thrown.

Reproduce steps:

When setting a wrong source or target address, exceptions would be
thrown, but not logged into log file.

Change-Id: Ic2c59e04aa6099f3ede0c6b8579c31a3dfff895c

vuntz/glance,paramite/glance,takeshineshiro/glance,ozamiatin/glance,sigmavirus24/glance,redhat-openstack/glance,citrix-openstack-build/glance,jumpstarter-io/glance,rickerc/glance_audit,jumpstarter-io/glance,saeki-masaki/glance,cloudbau/glance,tanglei528/glance,cloudbau/glance,SUSE-Cloud/glance,scripnichenko/glance,wkoathp/glance,kfwang/Glance-OVA-OVF,rickerc/glance_audit,stevelle/glance,tanglei528/glance,redhat-openstack/glance,ntt-sic/glance,JioCloud/glance,rajalokan/glance,rajalokan/glance,openstack/glance,darren-wang/gl,paramite/glance,ozamiatin/glance,takeshineshiro/glance,wkoathp/glance,kfwang/Glance-OVA-OVF,darren-wang/gl,akash1808/glance,klmitch/glance,vuntz/glance,JioCloud/glance,citrix-openstack-build/glance,sigmavirus24/glance,dims/glance,openstack/glance,saeki-masaki/glance,klmitch/glance,SUSE-Cloud/glance,stevelle/glance,openstack/glance,akash1808/glance,scripnichenko/glance,ntt-sic/glance,dims/glance