Remove get_ram_size_in_mb, get_number_of_vcpus, etc

get_ram_size_in_mb() is never used since the commit
Ia34d7c75ad05f7658d1abb7bebeb1bbd271fd089 when adding this method
at first time.

get_number_of_vcpus() is used in test_verify_created_server_vcpus
only in whole OpenStack projects. And the method just calls exec_command()
with a simple command. It is not necessary to define it as common method.

get_hostname() is used only in test_host_name_is_same_as_server_name
only in whole OpenStack projects. And the method just calls exec_command()
with a simple command. It is not necessary to define it as common method.

Before defining remote_client as stable interface, this patch removes the
methods for the cleanup.

NOTE: This removal affects to Tempest only without
      any other projects.

Change-Id: I638055d728d7406cd5ad64ee13701ef826287dd0
3 files changed