change default deployment type from war to ftp

[jdneo]

Since ftp is a more generic way for deployment, so making ftp to be the default deployment type could be a better choice.

Meanwhile this can fix the issue: #156

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (develop@222cacb). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff             @@
##             develop     #157   +/-   ##
==========================================
  Coverage           ?   60.53%           
==========================================
  Files              ?       50           
  Lines              ?     1566           
  Branches           ?      171           
==========================================
  Hits               ?      948           
  Misses             ?      558           
  Partials           ?       60

Impacted Files	Coverage Δ
...crosoft/azure/maven/webapp/AbstractWebAppMojo.java	0% <ø> (ø)
...zure/maven/webapp/handlers/HandlerFactoryImpl.java	0% <0%> (ø)

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