Resolve "Refactor NETCONF code after migrating to sysrepo2"

Closes #2601 (closed).

• 3d0f2198 renames in NETCONF code

  • s_val -> data_node or value
  • SysrepoError -> NetconfError
  • sysrepo_error.h -> netconf_error.h
  • TranslatorBasic::delItem() -> TranslatorBasic::deleteItem()
  • TranslatorBasic::value() -> TranslatorBasic::translate()

• 3b8f6af5 aliases for service_pair.{first,second}

• 9745ff39 decode64 and encode64 are now methods in TranslatorBasic

• 87574650 EXPECT_NO_THROW -> EXPECT_NO_THROW_LOG

• f5d82960 EXPECT_THROW -> EXPECT_THROW_MSG

• 6a86369c remove empty constructors and destructors

• 83270676 typedef -> using

• 9134e777 use std smart pointers where possible

• 272b48f2 renames in NETCONF code

  • subscribeConfig -> subscribeToDataChanges

  And mainly to appease doxygen:

  • translate(DataNode, string) -> translateFromYang(DataNode, string)
  • translate(ElementPtr, LeafBaseType) -> translateToYang(ElementPtr, LeafBaseType)
  • get*(xpath) -> get*FromAbsoluteXpath(xpath)

• 8c267d3e clean up header includes and makefiles in NETCONF code

• 3c06dd57 make NETCONF_SUBSCRIBE_NOTIFICATIONS_FAILED a warning

• 0f6cd39f use checkAnd{Get,Set} where possible

• 3e2fd8cf update the YANG modules with three extra nodes

  • extended-info-checks
  • ignore-rai-link-selection
  • template-test

• 20a54731 remove std:: prefix from .cc files

• c7545640 rename TranslatorBasic to Translator

• 9c9ffcd2 make Translator aware of all leaf base types

  Also add leafrefs and the empty leaf to the keatest-module. And add tests for those, and also unions, dec64, int64, uint64.

• 7803d398 remove schema node checking from translator

• 39623a7b add Translator::checkAndSet

• 97d60fbb remove std:: prefix from .cc files

• 1d032343 fix doxygen and add override final

• 0089b933 update YANG developer guide

• 84311807 fix typos in NETCONF code

• 007879b1 remove the use of const_pointer_cast in NETCONF code

  If the casted element is mutated after the fact, there may be undefined behavior.

• 63f6df8b add ChangeLog entry

#huge-sorry