(maint) Docker dig names prior to running host

[Iristyle]

• Unexpectedly, a Travis failure was also encountered where 30 seconds
  of running host postgres.internal failed, but the immediately
  subsequent call to dig postgres.internal succeeded.

  Running dig seems to prime a local cache, so perform a dig prior
  to host in an effort to help fix this problem, given the PDB
  container is based on Alpine

  Intermittent DNS failures when running Alpine containers in user-defined docker-compose network microsoft/opengcs#303

[Iristyle]

Interestingly, a failure occurred in Travis this time, so the hope is that this workaround removes this problem - see https://travis-ci.com/puppetlabs/pupperware/builds/110593664#L1363-L1383

2019-05-03T23:55:21.053594047Z  wtfc.sh: waiting 30 seconds for host postgres.internal
2019-05-03T23:55:51.011479403Z  Terminated
2019-05-03T23:55:51.012047345Z  wtfc.sh: timeout occurred after waiting 30 seconds for host postgres.internal to return status: 0 (was status: 143)
2019-05-03T23:55:51.023320720Z  .............................
2019-05-03T23:55:51.023346839Z  ; <<>> DiG 9.12.4-P1 <<>> postgres.internal
2019-05-03T23:55:51.023352684Z  ;; global options: +cmd
2019-05-03T23:55:51.023981084Z  ;; Got answer:
2019-05-03T23:55:51.023995755Z  ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22197
2019-05-03T23:55:51.024000561Z  ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
2019-05-03T23:55:51.024004264Z  
2019-05-03T23:55:51.024007415Z  ;; QUESTION SECTION:
2019-05-03T23:55:51.024010745Z  ;postgres.internal.		IN	A
2019-05-03T23:55:51.024014327Z  
2019-05-03T23:55:51.024017537Z  ;; ANSWER SECTION:
2019-05-03T23:55:51.024021080Z  postgres.internal.	600	IN	A	172.18.0.3
2019-05-03T23:55:51.024025089Z  
2019-05-03T23:55:51.024028172Z  ;; Query time: 3 msec
2019-05-03T23:55:51.024031533Z  ;; SERVER: 127.0.0.11#53(127.0.0.11)
2019-05-03T23:55:51.024034890Z  ;; WHEN: Fri May 03 23:55:51 UTC 2019
2019-05-03T23:55:51.024038187Z  ;; MSG SIZE  rcvd: 68
2019-05-03T23:55:51.024041514Z  

[puppetlabs-jenkins]

Test PASSed

[Iristyle]

After a small error, looks like this is doing what I want now:

wtfc.sh: waiting 30 seconds for dig postgres && host postgres
wtfc.sh: dig postgres && host postgres finished with expected status 0 after 8 seconds

; <<>> DiG 9.12.4-P1 <<>> postgres
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58763
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;postgres.			IN	A

;; ANSWER SECTION:
postgres.		600	IN	A	172.19.11.139

;; Query time: 0 msec
;; SERVER: 172.19.0.1#53(172.19.0.1)
;; WHEN: Sat May 04 02:17:50 UTC 2019
;; MSG SIZE  rcvd: 50

[puppetlabs-jenkins]

Test PASSed