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WIP | Consolidating fabric operations related methods #56

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WIP | Consolidating fabric operations related methods #56

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Commits on Apr 5, 2016

  1. Use ssh agent to connect between remote machines 

    Current method - copy ssh private key to remote node1 and then try to
ssh using that key file - is not required, as ssh-agent forwarding will
enable such facility without ssh private keys present in subsequent
machines. You just need private key on test node and no need to copy
private key to anywhere else, just run ssh-agent on test node and run
the command on remote nodes (even between remote nodes with agent
forwarding enabled.

Added tools/common.sh with common bash functions.
Added a new function "prepare"  and also added a new
parameter to run only "prepare". This will be helpful in case of
manually running tests which actually need running tools/configure.py as
well as starting ssh-agent on test node.
    @hkumarmk
    hkumarmk committed Apr 5, 2016
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  2. Added missing dependency modules in requirements.txt

    @hkumarmk
    hkumarmk committed Apr 5, 2016
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  3. Moved fabric related methods to tcuils.fabutils 

    This is to refactor certain common code to central place and to reuse
them. Current effort is to consolidate methods which use fabric
operations to single place and avoid importing fabric module to various
other files but to use the methods from fabutils.
    @hkumarmk
    hkumarmk committed Apr 5, 2016
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  4. Renamed run_cmd_through_node to run_cmd to use it in wider usecases 

    This method to be used to run command on any remote nodes - whether it
is a remote server or VM or between VMs. This method has capability to
handle:

1. run remote command on remote server from test node
2. Run remote command on node-a through node-b from the test node
  * in this case node-a is the target node, node-b is gateway, and the
nodes will be connect from testnode
  * This is to avoid situation to login to remote node (node-b in this
    case) and run script (fab script or pexpect or any such code) on
    that remote node (node-b) against running command on target node
    (node-a)
3. Run remote command on VM thorugh compute node - Same usecase as of Juniper#2
4. Run remote commands between VMs - say copy a file from vm1 to vm2
through compute node of vm1.
  * This will use ssh-agent forward to avoid copying ssh private keys to
    subsequent servers - Previously we used to copy ssh private keys to
    compute node and then copy the same file to vm1 in order to be able
    to connect from vm1 to vm2.
  * The commands will be running sitting on the test node then run an
  * "ssh/scp" command on vm1 through compute node of vm1 with
    agent_forward on
  * in this case flow is like this: test_node ->
    compute_of_vm1(gateway - passthrough) -> vm1 (run ssh/scp there) ->
    vm2 (final command is run)

NOTE that in all above situations ssh is initiated from the test node
and NO NEED TO SSH TO ANY OTHER NODE AND RUN SSH/FAB COMMANDS FROM
THERE.
    @hkumarmk
    hkumarmk committed Apr 5, 2016
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  5. Replace run_fab_cmd_on_node with run_cmd 

    Removed run_fab_cmd_on_node from the codebase and replaced all
occurances of it with run_cmd.
    @hkumarmk
    hkumarmk committed Apr 5, 2016
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