Fix importer jar name in release artifact

[steven-sheehy]

Detailed description:

• Fix jar named as jarname=hedera-mirror-importer-0.5.0-beta2.jar inside tgz
• Simplify script to just use $NAME (having a version with or without v doesn't matter to deploy.sh)
• Add set -e to fail fast when any commands returns non-zero
• Bump version to 0.5.0-beta3

Which issue(s) this PR fixes:

Special notes for your reviewer:

Checklist

• Documentation added
• Tests updated

[codecov]

Codecov Report

Merging #473 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #473      +/-   ##
============================================
- Coverage     60.79%   60.75%   -0.04%     
+ Complexity      101      100       -1     
============================================
  Files            78       78              
  Lines          2686     2686              
  Branches        340      340              
============================================
- Hits           1633     1632       -1     
  Misses          899      899              
- Partials        154      155       +1

Impacted Files	Coverage Δ	Complexity Δ
...era/mirror/grpc/listener/PollingTopicListener.java	93.75% <0%> (-3.13%)	11% <0%> (-1%)

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[Nana-EC]

LGTM