split TRACING_JAEGER_SAMPLING_SERVER_URL to two env vars

[ashleyschuett]

What does this PR do?

Split tracing URL to be able to be specified by two seperate envs, one for host, one for port

[codecov[bot]]

Codecov Report

Merging #428 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #428   +/-   ##
=======================================
  Coverage   40.46%   40.46%           
=======================================
  Files          76       76           
  Lines        2659     2659           
=======================================
  Hits         1076     1076           
  Misses       1520     1520           
  Partials       63       63

Impacted Files	Coverage Δ
pkg/config/specification.go	62.5% <ø> (ø)	:arrow_up:

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[aleksandrzhiliaev]

+1

[spetrashov]

+1