Retry logic for the connection-oriented commands

[arm4b]

The most-frequent random error when installing StackStorm is related to installing/downloading packages or similar download-oriented operations (connection closed, 50X, SSL broken pipe, GnuTLS recv error, etc). All temporary.

Needs adding retry on failure logic where applicable.

Example: https://travis-ci.org/StackStorm/ansible-st2/jobs/240785678#L925

fatal: [localhost]: FAILED! => {"changed": true, "failed": true, "msg": "https://packagecloud.io/StackStorm/unstable/el/7/x86_64/st2mistral-2.3dev-102.x86_64.rpm: [Errno 14] curl#56 - \"TCP connection reset by peer\"\nTrying other mirror.\n\n\nError downloading packages:\n  st2mistral-2.3dev-102.x86_64: [Errno 256] No more mirrors to try.\n\n", "rc": 1, "results": ["Loaded plugins: fastestmirror, ovl\nLoading mirror speeds from cached hostfile\n * base: mirror.steadfast.net\n * epel: mirror.steadfast.net\n * extras: mirrors.gigenet.com\n * updates: ftpmirror.your.org\nResolving Dependencies\n--> Running transaction check\n---> Package st2mistral.x86_64 0:2.3dev-102 will be installed\n--> Finished Dependency Resolution\n\nDependencies Resolved\n\n================================================================================\n Package          Arch         Version          Repository                 Size\n================================================================================\nInstalling:\n st2mistral       x86_64       2.3dev-102       StackStorm_unstable        29 M\n\nTransaction Summary\n================================================================================\nInstall  1 Package\n\nTotal download size: 29 M\nInstalled size: 142 M\nDownloading packages:\n"]}

[arm4b]

TASK [st2 : Install libffi-devel on EL6] ***************************************
       task path: /tmp/kitchen/roles/st2/tasks/main.yml:2
       fatal: [localhost]: FAILED! => {"changed": false, "msg": "Failure downloading http://rpmfind.net/linux/centos/6/os/x86_64/Packages/libffi-devel-3.0.5-3.2.el6.x86_64.rpm, Request failed: <urlopen error timed out>"}

[arm4b]

 TASK [nodejs : Add nodesource key] *********************************************
       task path: /tmp/kitchen/roles/nodejs/tasks/nodejs_apt.yml:8
       fatal: [localhost]: FAILED! => {"changed": false, "msg": "Failed to download key at https://keyserver.ubuntu.com/pks/lookup?op=get&fingerprint=on&search=0x1655A0AB68576280: Connection failure: ('The read operation timed out',)"}