Fix salt.modules.mount.active to use /proc/self/mounts, unless user explicitly enabled use of /proc/self/mountinfo via extended=True option. Fix remount on every state application, when options that don't appear in /proc/self/mounts are used.
Merge pull request #15464 from dmuntean/fix-mount-options-on-linux

Fix mount module and state on linux to stop remounting every time state is executed.