TT#124273 Use pathname under debian/tmp instead of source root

With newer debhelper versions, it tracks what has been installed and
what is left over under debian/tmp. When using pathnames not matching
the ones seen we confuse debhelper. Also this removes redundant pathname
information for the destination.

Change-Id: I6161119d6d6ad6447c0f927a8e6566036ccf4d5a

debian/libngcp-api-client-perl.install

@@ -1 +1 @@
-usr/share/perl5/NGCP/API/Client.pm  usr/share/perl5/NGCP/API/
+usr/share/perl5/NGCP/API/Client.pm

debian/ngcp-billing-tools.install

@@ -1,2 +1,2 @@
-bin/ngcp-credit-warning  usr/sbin/
-bin/ngcp-fraud-notifier usr/sbin/
+usr/bin/ngcp-credit-warning usr/sbin/
+usr/bin/ngcp-fraud-notifier usr/sbin/

debian/ngcp-provisioning-tools.install

@@ -1,9 +1,9 @@
-bin/ngcp-api-admins             usr/bin/
-bin/ngcp-api-ping               usr/bin/
-bin/ngcp-create-customer        usr/bin/
-bin/ngcp-create-domain          usr/bin/
-bin/ngcp-create-subscriber      usr/bin/
-bin/ngcp-delete-domain          usr/bin/
-bin/ngcp-get-customer           usr/bin/
-bin/ngcp-terminate-customer     usr/bin/
-bin/ngcp-terminate-subscriber   usr/bin/
+usr/bin/ngcp-api-admins
+usr/bin/ngcp-api-ping
+usr/bin/ngcp-create-customer
+usr/bin/ngcp-create-domain
+usr/bin/ngcp-create-subscriber
+usr/bin/ngcp-delete-domain
+usr/bin/ngcp-get-customer
+usr/bin/ngcp-terminate-customer
+usr/bin/ngcp-terminate-subscriber