[WIP][Android] Tls connection on tcp (remote)

[talregev]

Fixes #2466
Tls connection on tcp (remote)
Still not working. missing root certificate:
Trust anchor for certification path not found.

https://stackoverflow.com/questions/23103174/does-okhttp-support-accepting-self-signed-ssl-certs/60102517#60102517
https://developer.android.com/training/articles/security-config

https://stackoverflow.com/questions/6825226/trust-anchor-not-found-for-android-ssl-connection
https://stackoverflow.com/questions/2642777/trusting-all-certificates-using-httpclient-over-https/6378872#6378872

[codecov]

Codecov Report

Merging #4444 (a88e802) into master (45fb85f) will decrease coverage by 0.05%.
The diff coverage is 0.55%.

@@             Coverage Diff              @@
##             master    #4444      +/-   ##
============================================
- Coverage     10.30%   10.25%   -0.06%     
  Complexity      946      946              
============================================
  Files           277      277              
  Lines         35336    35513     +177     
  Branches       1185     1185              
============================================
  Hits           3643     3643              
- Misses        31506    31683     +177     
  Partials        187      187              

Impacted Files	Coverage Δ
...src/main/java/edu/berkeley/boinc/SplashActivity.kt	0.00% <0.00%> (ø)
lib/network.cpp	0.00% <0.00%> (ø)
...rc/main/java/edu/berkeley/boinc/rpc/RpcClient.java	30.50% <14.28%> (-0.18%)	⬇️