Remove integrationtest from DH_GOLANG_EXCLUDES

We should run the integration tests when building the package.

Fixes issue #7.

debian/rules

 #!/usr/bin/make -f
 
 export DH_GOPKG := git.autistici.org/ai3/accountserver
-export DH_GOLANG_EXCLUDES := vendor integrationtest
+export DH_GOLANG_EXCLUDES := vendor
 
 # Include all files in copy, not just *.go files.
 # Required for tests to run successfully (due to the java ldap server).