This branch fixes the manifest generation in OVA files (LP:1627931)

The .ova file extension was passed twice, resulting in file not found errors in
both the general case and the vagrant-specific file creation.

live-build/ubuntu-cpc/hooks/041-vmdk-ova-image.binary

@@ -67,7 +67,7 @@ ovf_sha256=$(sha256sum ${ovf} | cut -d' ' -f1)
 manifest="${scratch_d}/${prefix}.mf"
 cat > "${manifest}" <<EOF
 SHA256(${vmdk_f##*/})= ${vmdk_sha256}
-SHA256(${ovf##*/}.ovf)= ${ovf_sha256}
+SHA256(${ovf##*/})= ${ovf_sha256}
 EOF
 
 # Now create the OVA

live-build/ubuntu-cpc/hooks/042-vagrant.binary

@@ -181,7 +181,7 @@ manifest="${box_d}/${prefix}.mf"
 cat > "${manifest}" <<EOF
 SHA256(${vmdk_f##*/})= ${vmdk_sha256}
 SHA256(${cdrom_vmdk_f##*/})= ${cdrom_sha256}
-SHA256(${ovf##*/}.ovf)= ${ovf_sha256}
+SHA256(${ovf##*/})= ${ovf_sha256}
 EOF
 
 # Now create the box